Update issue #85 : reliability improvements to IPersistStream XML saving

git-svn-id: http://graph-studio-next.googlecode.com/svn/trunk@138 c2f33eb2-41b2-391d-4cb4-d9d0608729ba
Update issue #99 : Removed middle button click on empty area to refresh - too easy to miss and refresh accidentally.


git-svn-id: http://graph-studio-next.googlecode.com/svn/trunk@139 c2f33eb2-41b2-391d-4cb4-d9d0608729ba