interim fix for turreted units moving in too close to target

Sets RangeTolerance to 0 as an interim solution.
Increases weapon range of jeep and all 4 tanks with cannons in RA mod by 1 cell.

This reduces the annoying behavior of turreted units moving close to their target, exposing themselves to friendly fire and reducing their effective attack range. (issue #2104)

I'm aware this might make it more difficult to attack fleeing targets, but that is already the case for none-turreted units anyway. I didn't notice much of a problem during testing, but more testing from others may be needed to verify this.

If disabling the RangeTolerance is considered too problematic, maybe settle for only increasing the weapon range of the turreted units for now as a little band aid.