Small tweaks for Windows: no version information in path anymore but in the name as it appears in "add/remove software"

The ALPUG plugin now uses a better way of validating the provided station_ids, by checking if at least one file matching the station ID can be found in the METEOPATH. If not, most probably the station ID is wrong. If yes, then some years are simply missing (and no error message or warning is generated). The silent skip of duplicates is now commented out in order to shame the owners of messed up data.

The warnings have been fixed. The ALPUG plugin now supports metadata (a specific file format has been designed for it), supports duplicates in the data files (since this seems to happen quite often) with either no reporting (for limited number of duplicates) and reporting a warning for the begining of a large duplicated block of data. The plugin also now handles better missing files: if some files have already been found for this station, a warning is printed out but the execution continues. If no single file was found for a given station, an exception is thrown. The documentation has also been written.

The DAILY_AVG temporal interpolation is now in order. It has been properly tested on avg/range and still needs testing on min/max or min/avg or max/avg.

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

The DAILY_AVG interpolation now produces smooth interpolations. The code will be refactored later to be more modular and more compact.

A new temporal interpolation method has been introduced, to generate sinusoidal variations of a given mean and range. This is far from perfect (discontinuities between two days) but this is a start... 

Better plugin template, as mentioned in issue 411. Brief description of the scripts in tools/ in the examples readme.

The time range output of smet_range now shows the average sampling rate. The smet2kml script should now better custom SMET files having a larger than usual header (such as .sno files).

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The updated smet_range script now supports Julian timestamps (and converts them to ISO), properly shows empty lines for stations that miss the requested parameter and properly converts K to C when necessary. It also prints a usage message when ran without arguments and can take as argument a path.

The new smet2kml script creates a kml file locating all the smet stations provided in a given directory. This kml can then be loaded on map.geo.admin, googlemaps, etc and shows markers with station ids.

A new readDirectory() method has been implemented that directly returns a list of strings (slightly more convenient to use). An innacurracy has been fixed in IOUtils: lat_epsilon and lon_epsilon were defined in rad when they should have been in deg. The Coords::toString() method has been slightly improved by allowing more digits for lat/lon. The smet_extract.sh script can now provide a list of available fields if no field has been specified.

Some threshold were making trouble for very high resolution simulations with Winstral, they have been changed. A broken link has been fixed in NetCDFIO.

The Winstral interpolation was not behacing properly when dealing with a DEM with holes, this has been fixed. Otherwise, the grids initializations use some recently introduced API that makes the code easier to read.

An invalid C to K conversion was fixed (it used the water triple point temperature instead of melt/freeze). A much improved smet_extract that processes one file at a time has been committed. The config object now is much more verbose when reporting an invalid key and does not write out invalid key/values (basically, key with empty values). This makes it possible for example in Snowpack to re-run a simulation using the backed up ini file (without any changes).

Anselm koehler contributed these two Matlab scripts to read and plot SMET files, making use of all fields and metadata. 

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.

Now multiple DEMS can be cached. The implemented solution is not fully satisfactory (a API change for all plugins would be required), but at least the core of it is implemented (in the Buffer class).

The GridBuffer class has been expanded and is now used by Meteo2Dinterpolator for interpolated grids

A gridBuffer class has finally been implemented (basically, moving the old grid buffering code into it) and is now in use for the GridsManager. An invalid file name in the examples has been fixed and a toString() debug message has been improved in the TimeSeriesManager.

When using Winstral with precipitation AND exclusively positive temperatures, the deposition mass was zero and was leading to an arithmetic error

When using Ordinary Kriging, the nodata cells where still computed... This has been fixed, they are now properly skipped.

Trying to make the documentation more user-friendly. The smet2agr script has been modernized (changing the syntax of a regular expression).

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

The LIDW algorithm has been restructured in order to look more similar to IDW. It is still quite special, though.

It is now possible to write timestamps as ISO_WEEK (this is YYYY-Www-dd). This is now used for the reports generated by DATA_QA in order to ease data aggregation. The GSN plugin has a new key: GSN_TIMEOUT. A bug in error handling was fixed in the GSN plugin.

The Date class can now compute the dow of week as well as the ISO week number. Fixed a documentation typo in FindMySQL.cmake

The Buffer class is now used to buffer meteo time series. Since this is not (yet) a proper ringbuffer, all data is erased before pushing more data into a buffer (similarly to what it was before this commit). It has been tested with data_converter on numerous data (including with virtual stations) as well as with snowpack on operational stations.