Fixes #1691 (Parent network not loaded in 3.0 from 2.8 generated session file) : Also making sure stale values for network attribute "Cy2 Parent Network.SUID" are removed when a Cy2 session is loaded.

git-svn-id: http://chianti.ucsd.edu/svn@31059 0ecc0d97-ab19-0410-9704-bfe1a75892f5
Refs #1691 : Patch to 3.0 release branch

git-svn-id: http://chianti.ucsd.edu/svn@31060 0ecc0d97-ab19-0410-9704-bfe1a75892f5
Updated CustomGraphics stuff to simplify signature of generics


git-svn-id: http://chianti.ucsd.edu/svn@31061 0ecc0d97-ab19-0410-9704-bfe1a75892f5
Updated to CustomGraphics to simplify generics signature


git-svn-id: http://chianti.ucsd.edu/svn@31062 0ecc0d97-ab19-0410-9704-bfe1a75892f5
Modified to support final CustomGraphics API


git-svn-id: http://chianti.ucsd.edu/svn@31063 0ecc0d97-ab19-0410-9704-bfe1a75892f5
Modified to support final Custom Graphics API


git-svn-id: http://chianti.ucsd.edu/svn@31064 0ecc0d97-ab19-0410-9704-bfe1a75892f5