Bow Rebalancing

Magic Bow:
Doubled range to match long bow.
Added 100 hit roll modifier to match long bow.
Added 1 weapon damage.

Neru Bow:
Set spell modifier to match battle bow.
Added 1 damage.

Both of these weapons are now equivalent to a common type of bow, except
with 1 extra damage. Admins can always further modify their properties
if they wish, but magic bows were strictly inferior long bows, and neru
bows were overpowered battle bows.
Merge pull request #9 from M59Gar/bows

God-given Bows Fix