Use weight as a penalty

[sjlehtin]

Accumulated weight for the character should penalize skill checks.

If possible, the effects on the stats should be itemized somehow to make it easier to troubleshoot and modify the characters loadout.

[sjlehtin]

Ammo weight for firearms is an issue; the ammo counts should be in the sheet.

Solution and a new feature: allow adding and decrementing ammunition easily, this will accomplish both the weight issue and keeping track of ammunition.

[sjlehtin]

Ammo calculations etc to be handled separately; all weights from items and armour should be accounted for with the current version.