stevehalasz 656a9f7a3d Try to get GISBASE from:
1. GISBASE env var
  2. QSettings
  3. --with-grass configure flag

Before resorting to asking the user for it. Still need to provide
some more information in the file dialog.


git-svn-id: http://svn.osgeo.org/qgis/trunk/qgis@2738 c8812cc2-4d05-0410-92ff-de0c093fc19c
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