Nazghul/Haxima: the Feature Marathon has begun

Finally started in earnest on that big long feature request list at SourceForge. Today I added support for multiple save games (that one has been on the list for over two years), a L)oiter command, and kaypy's request for "NPC's as light sources". He was bothered by the fact that they wandered around in the dark... I guess it was a little weird. I tried two approaches to that before just adding a default AI to pretty much everybody. A lot of the monsters will use this now, too, which may be undesirable in some cases. I'll deal with those on a case-by-case basis.