Small optimization in the SNIO plugin.

Introduced the basic structure that will be required to build a new plugin to read Matlab files prepared by the OSHD project/service. This is not usable yet but should come quite soon.

A resampling method has been added to the Grid2DObject so it is possible to change the cellsize. The support for the '*' wildcard has been added to the KEEP and EXCLUDE keys.

Code cleanup: more consistency in the handling of keep/exclude/merge. Better, more explicit error messages.

More detailed error messages when the timestamps are not properly sorted. Better behavior of the GSN plugin when the data is missing but the metadata could be retrieved (so at least we know that the station is valid).

Several exceptions have been renamed in order to be more generic (ex: instead of FileNotFound -> NotFound) and their text has been modified accordingly. The GSN plugin now reports the errors with more relevant details (invalid sensor name, no permissions).

Fixed a small bug in the MERGE feature and small improvements to the GSN plugin (always set a station ID, up to date documentation, more possibilities in the parameters names matching). Otherwise, minor code cleanup.

A few extra comments have been added to better understand the flow of data. The "merge" feature was not properly handling all situations, this should now be fixed.

The EXCLUDE/KEEP/MERGE keys (as well as the associated stationIDs) were case sensitive and this was making trouble. This is now case-insensitive. A warning flag has been changed for Clang to prevent reporting fake warnings (the flag does not make sense at all and only exists for compatibility reasons).

The MERGE feature has been much improved: the syntax now follows the (more logical) EXCLUDE/KEEP syntax: 
*WFJ::MERGE = WFJ2 WFJ1
The documentation and debug toString() have been updated.

A new "raw data editing" method has been implemented: merge_by_name. Stations sharing a common name can be merged together with the MERGE_BY_NAME key in the [Input] section. The documentation has been edited to bring visibility to the "raw data editing" features.

Code cleanup and fix for IMIS: now the ENET stations receive the number 1 for the automatic stations instead of 0.

Finally, a long awaited (and MAJOR) change: HNW is gone, it is now PSUM. This name should be clearer and every occurences of "HNW" (even in temporary variables or algorithms) have been replaced by psum. A check is performed on keys containing "hnw" and an exception is thrown if some are found, urging the user to update the ini file. Please keep in mind that the calling codes have to now refer to MeteoData::PSUM and that some algorithms are now named differently!

Trying to close some potential security flaws (using FlawFinder). All files opened for reading are now checked and special files (devices, etc) are refused.

The CNRM plugin can now be enabled and properly works. Its documentation has been updated and improved. The NetCDF plugin can now read DEMs using various schema/conventions and its documentation now matches the code. A few more MeteoGrids have been defined that are required for meteorological model outputs and for some future spatial interpolations (ISW_DIR, ISW_DIFF for example). The PNG plugin creates a few more EXIF fields in order to make it very easy to integrate in google earth (but it seems that google earth does not like indexed pngs). A bug computing the geolocalization of grids coming from NetCDF has been fixed (all grids were slightly off).

A new plugin has been created to read the data from the ALPUG stations (ascii format). This is still a work in progress...

Similarly to the "::EXCLUDE" statement, it is now possible to use a "::KEEP" statement. This makes it possible to keep only a few parameters from given stations.

A new plugin has been contributed to acces the SASE Mysql database (obviously, this only makes sense from within SASE).

Slightly improved toString() output as well as first version of a proper Buffer class (not used yet)

In order to make it more modular and allow more advanced processing (virtual stations, downscaling, multiple io sources) the IOManager is now a proper wrapper: the processing is fully delegated to either a GridsManager or a TimeSeriesManager. These can in turn be reused at some other places (like in the Meteo2DInterpolator) to offer full buffering and processing of "local" time series. The buffering is now done by these two new classes (therefore the BufferedIOHandler class has been removed) and it is planned that dataClasses will be implemented for proper ringbuffers (one for time series, one for grids and one for isolated points) and receive the generic buffering code later on. 

A new fastPow(double, int) has been implemented for positive exponents. The begining of a generic handling of units also appeared in IOUtils. Finally, the ProcessingLevels are now defined in IOUtils instead of IOManager.

When a plugin was throwing an exception, the mapPlugins could get corrupted in the (rare) case of the caller catching and moving forward (uncaught NULL pointer). This is now not anymore possible, by design.

Some documentation bugs have been fixed (multiple links definitions for doxygen). The config.dox file has been updated (in order to remove the warnings for obsolete keys). The parameter exclusion feature has been documented and now supports both a space delimited external file or by keys such as WFJ2::exclude = TA RH HS

A new IOUtils::getCWD() method has been created, a new Config::getConfigRootDir() has been created (to help resolve relative paths) and is now used for the ADD and MULT filters as well as for the EXCLUDE feature of PSQLIO and IOHandler.

The same exclude file as used for the PSQLIO plugin is now implemented in IOHandler: it is possible to provide a CSV file containing a list of station IDs (one per line) with a list of which parameters (MeteoData naming) to exclude for this station ID (comma separated). The file can be provided with a relative path.

The plugins are now handled by an object factory, removing the need for the IOPlugin class. Otherwise, small documentation update in GeneratorAlgorithms.

A few extra checks have been added for grid rescaling. Some indentation has been fixed and lots of variables made const. The documentation is now linked to the general plugins documentation.

The Idso clear sky ILWR has been added (and also added to the clear sky generator). Some (dead) code that was committed by mistake has been removed and the very begining of what will be needed for data creators put in place (still some way to go!).

The ClearSky and AllSky generators have been renamed as ClearSky_LW and AllSky_LW for clarity. The debug outputs (.toString()) have been improved. The Config::findKey method is now able to do pattern matching anywhere in the string (if "anywhere=true"). This makes some code simpler (for generators). 

The parameter copy feature has a new syntax: TA2::COPY = TA will copy TA into TA2 (clearer and more consistent). Please update your ini files if necessary!

First version of the new COSMO (in fact, FieldExtract) plugin. It currently only reads data from one single file that is provided as argument, but this file can contain all the stations and all the time steps. This plugin only relies on libxml2.

Removing an external include out of the PSQLIO header (just in case), updating/fixing some plugin documentation (PSQLIO and GSNIO).

Replacing "special points" by "Points Of Interest" in the documentation and the examples. Fixing warnings for BormaIO.