Fixes a number of minor bugs

Changelog:

 - fix: Select all doesn't work in trash in IE or with a single item
 - fix: Import Package does nothing when re-importing trashed package
 - fix: CS Posts get re-ordered when copy/paste
 - fix: Matrix best/worst now must have 10 or more votes
 - fix: When upgrading, two revisions of same asset added in same second.
 - fix: Uncommitted Snippets get cached when not in admin mode and are then served to visitors
 - fix: Admin Console icons sometimes not shown in IE7
 - fix: Syndicated Content asset not decoding with entities properly