Bugfix for returning wrong array shape when warping a 3D array

compatibility.gdalnumeric:
- OpenNumPyArray(): Bugfix for expecting (rows,columns,bands) instead of GDAL-like (bands,rows,columns)
- edited docstring
- added datatype assertion

geo.raster.reproject:
- moved availability check for resampling algorithm 'average' here

io.raster.gdal:
- get_GDAL_ds_inmem(): added docstring
- added get_GDAL_driverList()

io.raster.GeoArray:
- save(): bugfix for writing wrong array dimensions in case of 3D array
- show(): nodataVal is now excluded from vmin/vmax calculation when showing image

processing.progress_mon:
- printProgress(): changed bar symbol due to incompatibility to csh shell output stream