added fix to consider reversed axisLabels for 4326

fixed xpath expression

added check for wcs versions usage

prepared usage of multipart/mixed in request

fixed resetting of combo-boxes for output-format and output-crs and interpolation when connecting to new server

added check for existing coverage prior to load into qgis

wcs_client - removed version info in base_request

wcs-client - added check for axislabels and offered_crs

 added check for exisance of version parameter in request

fixed some typos

added Server+URLS for WCS and EO-WCS OGC Reference Implementaions by EOX