Fixes nine minor bugs.

Changelog:

 - fix: Image asset test fails
 - fix: Article attachments don't obey max image dimensions
 - fix: Article size doesn't include attachments
 - fix: Invalid group grouping entries can prevent admin admin mode and other operations
 - clean up invalid group groupings
 - fix: Editing events after upgrade shows incorrect time zone
 - fix: DataForm doesn't send mail if mail fields are in a tab
 - fix: Calendar feed list doesn't display in IE
 - fix: Event: attachments link icon not rendering (perlDreamer Consulting, LLC.)
     http://www.plainblack.com/bugs/tracker/event-attachments-link-icon-not-rendering