1) fixed the mutant fishes to not be zombie species. also to not revive
and to give meat, not tainted meat.
2) the fish_basic function was renamed to fish_rod to better reflect its
use
3) the FISH flag was renamed to FISHABLE to prevent confusion
4) a vector of monster* type (named catchables) was added to items class. its currently
used only to store the initial fish (in the vincinity of a fish trap),
so that we can check every 30' if more fish have wandered in. This is
so, b/c the fish trap needs to have a chance to catch every fish that
has wandered close by while it is fishing.
5) an operator== overload was added to monster.h in order to be able to
find if two monsters in two different vectors are in fact the same
object.
6) The feature update fishing lists every 30' was implemented successfully.
7) Misc typos were also fixed