[crossfire] New random map parameter

[Nicolas Weeger]

Hello.

In (partial) reply to feature request 
https://sourceforge.net/support/tracker.php?aid=1668158 i added a new 
parameter for random maps, 'multiple_floors'.
When set to non 0, the different rooms of generated map will have different 
floors (still taken from the same style map for coherence reasons).

To work, this needs doors and walls (needed to find rooms).

Nicolas
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