Added --file-cache directoryname command line option support to readNodeFiles(ArgumentParser&)  to make it easier to specify a local file cache, in place of the default OSG_FILE_CACHE env var.
Added --file-cache directoryname command line option support to readNodeFiles(ArgumentParser&) 
to make it easier to specify a local file cache, in place of the default OSG_FILE_CACHE
env var.


git-svn-id: 23b6355f2bb369032457de4eb5f713ee134f73a8@8316 16af8721-9629-0410-8352-f15c8da7e697

joevandyk/osg,joevandyk/osg,joevandyk/osg,joevandyk/osg,joevandyk/osg