Fix Freeze / Thaw for holds
Fix deleting titles from Reading History when titles have already been deleted.
Extract Hold functionality to a separate class so we don't have to load as much code for pages that touch Millennium, but not holds
Extract Reading History functionality to a separate class so we don't have to load as much code for pages that touch Millennium, but not holds
Code cleanup
Merge branch '2013.03.2' into 2013.04.0

Conflicts:
	vufind/web/Drivers/Millennium.php
	vufind/web/services/MyResearch/Holds.php
	vufind/web/services/MyResearch/lib/User.php