Merged from revision: 7099
Minor fixes/improvements for existing features (by Sevenfm)
1) Slightly reduced the size of merc's healthbar to fit general ja visual style.
2) Removed some unnecessary options for SHOW_HEALTHBARSOVERHEAD, SHOW_COVER_INDICATOR.
3) Several minor fixes.
4) New option: ENEMY_CLOCK_SPEED_PERCENT - set clock speed during enemy turns.
With this option, player can set default speed to comfortable value (100-120) and set increased speed for enemy turns (150-200).

git-svn-id: https://ja2svn.dyndns.org/source/ja2/trunk/GameSource/ja2_v1.13@7100 3b4a5df2-a311-0410-b5c6-a8a6f20db521