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 changes to the IOInterface (no more vec<vec<StationData>>) have been propagated into all plugins.

BUGFIX: When adding a key on the fly to the ConfigReader object it disappeared when accessing it in a plugin. Reason: The dynamic instantiation used the filename parameter in the constructor of the plugins instead of the ConfigReader object itself. Architectural change inside DynamicLibrary was necessary.

Overall all include statements within in the library have been replaced by angle brackets, the default install path for the include file is $CMAKE_INSTALL_DIR/include/meteoio, the meteoio libraries (static and shared) will be installed in $CMAKE_INSTALL_DIR/lib per default.

The plugins will be installed in the subdirectory $CMAKE_INSTALL_DIR/lib/meteoio/plugins

A new plugin has been introduced: PGMIO that reads/writes PGM graphic files as 2D grids. (using the template plugin, it took less than 30 minutes for implementing the write2Dgrid!!)

More documentation has been updated/added, the template plugin has been fixed for some issues, the example io.ini shows more plugins usage.

General cleanup: the time.cc example sets a timezone variable, an unnecessary "mio::" has been removed in Coords, and two template files have been added to help plugin development (and mentionned in the documentation). 

The cmake targets have been changed into "safe", "optimized", "par" and "hera". (the later being specific for the hera cluster).