The GSN_URL key is now mandatory and the GSN_USER and GSN_PASS are now optional (for publicly accessible sensors)

A bug has been found (thanks to ctest!) that was introduced when we added TAU_CLD: the new MeteoGrid SHADE was only partially implemented and this lead to segfaults. The decrementing code in ARCIO was wrong and this has been fixed.

Fixing two tests that were not working anymore (since a new parameter, TAU_CLD had been inserted). White spaces in MeteoData.h, more logical iteration in ARCIO.

The basic operators have been implemented in Grid2DObject and Grid3DObject as well as DEMObject (with the proper update strategy). 

In order to suppress the risk of out of date "ncols, nrows" and since these were redundant with Array2D<>.nx/ny, they have been suppressed and it is therefore now mandatory to rely on the getNx/getNy/getNz getters. This is much safer but impacted quite a lot of code... 

Adding a new meteo parameter: the cloud transmissivity TAU_CLD defined as iswr_meas / iswr_clear_sky (ie the potential radiation computed at ground level with a standard atmosphere, see Iqbal 1983). This parameter is already used by the AllSky_LW and PotRad generators and properly handled by the PNG plugin. The PNG plugin can now also properly output a hillshade (as MeteoGrids::SHADE).

A bug has been fixed in the Winstral implementation that could lead to infinite loops for very small DEMs.

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.

better file structure: all the classes purely focused on data storage (such as grids, dates, etc) have been moved into a "dataClasses" directory. All subdirectories are nhow named similarly to the classes and methods: the words after the first one are capitalized.

When caching interpolated grids, the info string was not cached, leading to empty info strings when reading from cache. Now the info strings are properly cached.

DEMObject: need to call the << >> operator of the parent class Grid2DObject in own operator<< and operator>>

Bugfix in a constructor (that was making an error on some systems) and updated the Stefan-Boltzmann constant according to http://physics.nist.gov/cuu/index.html

PSQLIO: Adding documentation. This plugin is still under development. Syntax of queries will very probably change! 

Fixed a documentation issue in GeneratorAlgorithms, fixed a warning in config.dox and wrote some documentation for the PSQL plugin. Some cleanup also took place in the PSQL plugin.

The Add and Mult filters can now take more arguments: it is possible to provide an hourly/daily/monthly correction to add/multiply in an external file (either absolute or relative path).