Beta 0.2 (non functional)

Implementation of combat system not going as planned. Committing so that
code can be reverted if recoding goes wrong.

CHANGES TO CONQUEST.JAVA
Made unit power integer variables static.
Added booleanUnitKilled boolean array with 6 indexes.
Added booleanAttackMode variable.
Added initUnitsKilled() method. Sets all values in booleanUnitKilled to
false.
Fixed move processing issue in processMove() method.
Added attackMode() method.
Added checkUnitKilled() method.
Added setAttackDirections() method.
Added msgBox() method.
Added check for booleanAttackMode variable to move butttons.
Added toggle for attack mode to btnAttackPressed().

CHANGES TO CONQUESTCOMBAT.JAVA
Simplified code in checkAttackPossibility() method.
Added functionality to getUnitCoords() method.
Added findOccupiedAdjacentEnemies() method.
Added findSpecificEnemyUnit() method.
Added findSelectedUnit() method.
Added attackUnit() method.
Added getPowerLevel() method.
Added killUnit() method.
Added msgBox() method.

CHANGES TO CONQUESTMAP.JAVA
Added check to see if the unit was killed before setting its occupied
location to true.
Added unit killed check to checkGridOccupied() method.
Added disableUnit() method.