OPTICKS-1526: Enhance capabilities for adding new Attribute fields for shapefiles

git-svn-id: http://opticks.svn.sourceforge.net/svnroot/opticks/trunk/future@18270 6d0fddd1-9640-0410-91f9-aa98d5e64d34
OPTICKS-1534: Bad Values can cause image generation to take a very long time

git-svn-id: http://opticks.svn.sourceforge.net/svnroot/opticks/trunk/future@18277 6d0fddd1-9640-0410-91f9-aa98d5e64d34
Added .gitignore files to match svnignore properties