cmake: fixed creation of relative paths in VigranumpyConfig.cmake
new version number: 1.10.0
fixed test_color.py (tests occasionally failed when they got unfortunate random numbers)
fixed AxisInfo copy problem in VigraArray.nonzero()
fixed bug in ArrayVector::insert()
updated documentation
removed obsolete files
updated MultiArrayView documentation
started documenting GridGraph
updated credits and changelog
finished documentation of GridGraph
minor improvements of GridGraph documentation
FIX: Cast to enum in unserialize()
(workaround for VS2010, similar to the version in make_from_map())