update minimap position as well when viewing a house
You can now use Alt + scroll to change brush size
Lock visible floor by default

This fixes issue #41
Oops, unlock if setting is not set
remove useless check when handling mouse presses

This saves a few branching
Tweak README a little bit
Use a fallback path for reading monsters

Monsters are not version-dependent so if they were placed on top of
/data/materials load them.
s/print/g_logger.debug