Monster Auto Heal mod

Description
To my great disappointment, I noticed that EA left out in BFME2 the auto-heal that monsters got when they attained a level 2 rank in the original. Great units such as Attack Trolls and the new Mountain Giants just seemed too 'disposable'. This mod corrects that. Mountain Troll, Drummer Troll, Attack Troll, Mumakil, Cave Troll, Mountain Giant, Fire Drake, Berserker and Ent now auto-heal. Also, I added the auto-heal to Berserkers and Ents.

Note:
1. The above units start with this feature at level 1. I didn't know how to make it work at level 2 and quite honestly units gain rank so quickly that it doesn't make that much difference. I prefer it this way anyway.
2. There is a delay and like heroes, these guys heal only when not in battle. 3. Wild monsters do not auto-heal. I may add that sometime.