Added crows, fixed typo, made friendly animals attack zombies

Conflicts:

	mongroupdef.cpp
Fixed axe spelling
Bite attack coded in.

Conflicts:

	mtypedef.cpp
Declared DI_BITE and DI_INFECTED

Conflicts:

	pldata.h
Added Bite wound and infection

Conflicts:

	disease.cpp
Setup mobs with bite attack, changed bleeding slightly.

Conflicts:

	mtypedef.cpp
Bite and infection done.

Conflicts:

	iuse.cpp
Curing infection and bite wounds, also added a recovery phase.

Conflicts:

	iuse.cpp
	iuse.h
Adjusted
Add monster flags to adjust vision range.
Add vision reduction flags to various monsters.
Reduce sight range of monsters, based on code by Oddzballs.