Commit fixes courtesy of Ryan O'Neill

Commit fixes courtesy of Ryan O'Neill
<--- snip --->
- Adds "Edit Message as New" functionality to messages in the sent folder
- Fixes < > showing as &amp;lt; and &amp;gt; when resuming draft or editing as new
- Now remembers priority when saving draft
- Now remembers the correct identity when resuming draft/editing as new (only for people using multiple identities)
- Fixed small bug that broke compose in new window on Resume Draft
<--- snip --->

git-svn-id: https://svn.code.sf.net/p/squirrelmail/code/trunk/squirrelmail@2661 7612ce4b-ef26-0410-bec9-ea0150e637f0