Some of theOSDH file names have changed. Some of the fields are not available anymore. Code cleanup in DBO.

In oshd, the stations' names are followed by the network they belong to, separated by a space. This messes up the log analysis scripts of Snowpack, so now the names are cleaned up in order to remove both networks names and spaces.

code restructuring in DBO to make it more similar to other plugins. Implemented a proper support for recursive METEOPATH in OshdIO (only the most recent files will be used for each time step, according to their run_date).

Added the structure for the upcoming DBO plugin, fixed an invalid copyright in GSNIO (the old plugin was ©epfl, the new one is ©slf), added a note to the oshd plugin.

A bug has been found in IOUtils::seek that lead to returning npos when the vector only contained 1 element (and at the requested timestamp). The OSHD plugin has been brought up to date with the latest content and naming of the oshd data files.

the key BUFF_CHUNK_SIZE has been renamed as BUFFER_SIZE for more clarity and its default value is now 370 (which makes more sense for most applications). Some documentation about it has been written.

More includes cleanup and code cleanup in the plugins (getting rid of the "stationindex" thing that was pretty much deprecated in all plugins)

A OSHD_DEBUG key has been added and the units are now properly supported when using commit https://github.com/tbeu/matio/commit/12b7d4051369716ef21a53540d1f3354fe0d4e97 of libmatio (the UTF-16 is now returned as ISO-8859-1). 

Small optimization in the SNIO plugin.

The OshdIO plugin, based on libmatio for reading Matlab binary files, is coming into shape... almost there!

A bug has been fixed in CosmoXMLIO: it was reading all the data with a time-shift (ie always reading the file *after* the timestep that it should have read).

A few documentation glitches have been fixed in IOInterface and Date and an invalid default value for the time zones fixed in SMETIO (instead of taking 0 as intended, it was always nodata). The missing files for the new OSHD plugin are now committed, although the plugin is NOT READY to be used yet.