#67 add NSR class that overrides constructor of os.SpatialReference
Add NSR to Domain
#67 remove Domain._from_xml()
#67 simplify Domain.__repr__ using NSR
#67 Replace WKT with srs.wkt in Domain
#67 fix documentation in DOmain and NSR
#67 add NSR() to vrt.py where necessary
#67 import NSR in vrt.py
#67 add NSR() to nansat.py where necessary
#67 raise errors in NSR() if no valid projection is provided
#67 add NSR to vrt.py. Fix non-package-style imports
#67 fix non-package-style imports in all mappers
#67 add NSR to test_nansatshape and fix bug in Nansat.get_transec()
#67 fix few bugs in Nansat.get_transect()
fix bug in mapper metno_hires_seaice with wrong indent of AttributeEreor
#67 fix bug in VRT.transfrom_points wrt options[]
# Update Mmosaic. median() and latest() wrt mutithreding
#67 implement mosaic testing within main()
Merge branch 'issue67-srs-input' into develop