Fixed some bad naming in DynamicLibrary, silenced an unnecessary warning from Visual C++ (urging us to use non standard library calls), fixed some DLL exports for Visual C++.

The arrays are now using the vector filling methods when possible. A specialized template for convertString(unsigned int) has been written. 

A two segments linear fit (for elevation detrending) has been implemented with a fixed inflection point. This is quite primitive but allows the LLIDW spatial interpolation to use it and therefore to behave like the traditional SLF SnowFit program. More work will be needed for fully configurable regression algorithm choice though... 

Some namming issues have been fixed in COSMOXML. A better emissivity handling has been implemented in SNIO to be closer to the original Snowpack (ie: compute clear sky ILWR when no cloudiness/emissivity is given).

The vw_max field has been added to CosmoXMLIO, and the plugin has seen some cleanup in its comments. Additional comments in Sun.cc should help understand acceptable values for several radiation parameters. 

A bug in SMETIO has been found (it was looking for METEOPATH in the input section even when smet was only used for outputs) and fixed.

Fixed a few compilation warnings found on Illusion. The buffer centering has been introduced in BufferedIOHandler: the user can specify centering as a fraction of the buffer size or as a duration before the requested date (when rebuffering). The documentation has been updated accordingly.

Debugging output cleanup in CosmoXML.

Write meteo data: OK

Read station data: implemented.
In this routine, the user must choose (= comment/uncomment) he we write every station or if we use the given date to filter which station are written

Notice: have to check how dateStart and dateEnd are chosen if we provide a single date (eg in meteo_reading.cc)... Now it takes "date - 6 hours" --> "date + 15 days - 6 hours"

Writes XML-files without the need of an external text-file

TO DO
Interpolation? Depends on the FieldExtra output format
Add variable MaxWindSpeed

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TO DO: write XML file from data

A new version of the CosmoXMLIO plugin is also part of this commit, with some necessary fixes in the CMakeLists

TO DO:
Implement humidity from Dew Point
Add Max Wind Speed?
Check if we have data from Grid Point or Real Station Location