- create and destroy OGRSpatialReferenceH in constructor/destructor
- move the PROJ.4 strings to OGR instead of a member variable and keep
track its validity in mIsValidFlag.
This reduces the need to allocate/deallocate of OGR structures and PROJ.4
parsing and thereby speeds it up quite a bit. Especially when on-the-fly
projection is in use.
- collect common code of createFromSrid, createFromEpsg and createFromSrsId
in the new loadFromDb method
NOTE: invalid PROJ.4 strings are now lost, I hope that doesn't break
anything.
git-svn-id: http://svn.osgeo.org/qgis/trunk@8263 c8812cc2-4d05-0410-92ff-de0c093fc19c
98444a4bd8