Update issue #112, issue #85 : Added user interface option for choose method of resolving pin references in XML to work around buggy filters
Fix references to filter index in XML loading
Save pin name in XML filter connections
Show dialogs in XML loading if filter creation or connection fails.

git-svn-id: http://graph-studio-next.googlecode.com/svn/trunk@149 c2f33eb2-41b2-391d-4cb4-d9d0608729ba