map resets.

[Mark Wedel <master@rahul.net>]

 This can be changed now in the map file itself (via crossedit, under
the map attributes.)

 Most shops have fixed reset times.  This means that when the map is
initially loaded, it will reset in X amount of time no matter how many
people enter and exit it.

 This can be undesirable for dungeons - if someone entered it 1.5 hours
ago, and decided to do nothing (looked to hard), and you then enter it,
it will reset in half an hour no matter what you do (note that maps will
not reset while you are on them.)

 I am not sure what version this change was put in at.

 The reset time can also be changed in the map files, and the maxixum
value can be changed in the config.h file.

 --Mark