mail_edit 6.x-1.1

This is version 1.1 of Mail Editor for Drupal 6.

It should work the same as 1.0, in a smaller footprint, and with an enhanced and prettier template list.

6.x-1.1 is the basis for porting to D7.

Enhancements since 1.0:
- More clean-up (no functional change).
- Further tune the template list.
- #1238416 by Pasqualle, salvis: Implement nicely-formatted and filterable template list.
- Move admin code to mail_edit.admin.inc to reduce the footprint (no functional change).
- More clean-up (no functional change).
- #916560 by jaydub, salvis: Coding standards cleanup.