Implemented capacity changing fix for MR engine

The MR engine uses a different variable to store/set it's capacity
'self.realBaseCapacity'.  Also fixed a few tag closing typos in
bogballe_M3W.xml that were mistakenly included in the last commit
Real fix for Capacity increase/decrease

BogballeM3W.lua changeCapacity function re-written so that it *actually
works*.  Removed the need for calculating the new capacity by dictating
what the capacity should be for each step in the vehicle XML.  Also
spits out a lot of debug info to the game log file to show what is
happening.
Removed Debug Print Statements