Update 1.2.51

ADD: Radio Operators can now use the Pass Ammo command
ADD: Driver/Gunner position, currently only used in the Char B-1 Bis

CNG: Revisions to the Char B-1 Bis (and similar revisions to the German Flammpanzer B2 F): Now fitted with a Radio; crew positions are now Commander/Gunner, Driver/Gunner, Loader, and Radio Operator; the latter two positions share access to one large hatch
CNG: Churchill III and IV now have limited APCR ammo April 1943 - June 1944, and Churchill III now has limited APDS ammo from June 1944
CNG: Tiger variants (including the T-VI) no longer have APCR ammo from January 1944, as Tungsten was too scarce by that time
CNG: Rare ammo available at start of day will now be at least half of the maximum possibly available (i.e. if max is 10, rather than roll 1-10 the game will roll 5-10)
CNG: Ballistic attacks (eg. rocket launchers and mortars) are now much less likely to score a critical hit (i.e. a direct hit on the target)

FIX: M18 Hellcat now has the correct Small unit size classification
FIX: Bug where a custom (alternate history) campaign starting in 1913 would have not appeared in the list of campaigns
FIX: Bug where maximum amounts of rare ammo were not being set properly if there were 2+ dates defined