OPTICKS-1469: Validate all data sets in the Import Options dialog when any change is made to the current data set.

git-svn-id: http://opticks.svn.sourceforge.net/svnroot/opticks/trunk/future@17846 6d0fddd1-9640-0410-91f9-aa98d5e64d34
Added .gitignore files to match svnignore properties