added cli arguments for number of doctors, soldiers, nurses and infected (--d, --s, --n, --i)
refactored grid generation, no more hardcoded stuff
adapted help message
minor changes to help message
fixes citizen count
people can switch places instead of only move to empty spaces eg they can move everywhere that isn't a wall or a dead body
dead bodies have a 1% chance to decay spontaneously, this should make infected walled in by bodies less likely
refactored and changed the logic.
more people die and the balance seems to be better.
should have commited earlier for selective changes, sorry.
generates nurses and soldiers now.
fixed the undefined xsize/ysize problem with maps
map takes precedence over other options
this should fix the floating point problems
Merge branch 'logic_changes' into logic_and_setup

Conflicts:
	infect.pl
should be pretty balanced now