Fixes about a half dozen bugs.

Gotchas:

 * The 7.4.8 upgrade script had an error for sites using Dashboards.
    This would prevent the script from completing successfully.  The
    script has been fixed for future releases. 

Changes: 

 - fix: Delete this entry link in data form header broken
 - fix: http://www.webgui.org/bugs/tracker/how-to-kill-a-webgui-website (perlDreamer Consulting, LLC.)
 - fix: Delete this entry link in data form header broken
 - fix: Image uploads fail when not using preload.perl
 - safely allow sorting by more fields in collaboration systems
 - fix: iCal link on calendar doesn't work
 - fix: error when deleting profile fields with non-alphanumeric names