Fixes a number of minor bugs

Changelog:

 - fix: Graph draws black triangle covering half the image
 - fix: upgrade.pl willing to upgrade from versions prior to 7.3.22
 - fix: Rich editor defaults to using uploads paths for images
 - fix: Auto Request Commit setting creates extra version tag if asset uses
   requestAutoCommit
 - fix: URL extensions (perlDreamer Consulting, LLC.)
     http://www.plainblack.com/bugs/tracker/url-extensions
 - fix: Some urls cause an asset to be inaccessible after creation/editing (perlDreamer Consulting, LLC.)
     http://www.plainblack.com/bugs/tracker/some-urls-cause-an-asset-to-be-inaccessible-after-creation/editing
 - fix: Secondary Admin can create user with Admin Privilege (IRC:blacksilver)
     http://www.plainblack.com/bugs/tracker/secondary-admin-can-create-user-with-admin-privilege