Made soldier able to do melee when his weapon has already been thrown.  This was a significant weakness and frustration for playing as the soldier.
Made level ups take more XP.  Moved calculate_level() and calculate_exp() into guy.cpp to be with the rest of this stuff.  Adjusted xp gain so you get even less from lower level guys.
Removed level bonus and made par_value count as a tenth of a multiplier point for the time bonus.