Recent minor changes (halldoor area, local maps, and slow-moving doors)

1) The halldoor area in Eregion has changed in regards to how it handles keys
   and zone resets with players inside the area.

2) "Local" maps as seen by "map rooms" and the locate magic spell will work in
   fewer rooms as of the next reboot.

3) Slow-moving ("heavy") doors have been rewritten. They ought to essentially
   work the same as before. Plesae report any bugs.