Update issue #65 : Fixed horizontal collisions caused by wide filters.
Some commenting and renaming to clarify smart placement code.
'bins' renamed in code as 'columns' for clarity
Re-enabled some anti-collision code that had been broken.

git-svn-id: http://graph-studio-next.googlecode.com/svn/trunk@128 c2f33eb2-41b2-391d-4cb4-d9d0608729ba
Update issue #99 : Fixed Middle button click on empty area to refresh graph (broken by r126)

git-svn-id: http://graph-studio-next.googlecode.com/svn/trunk@129 c2f33eb2-41b2-391d-4cb4-d9d0608729ba