[crossfire] skill/class cost table

[Mark Wedel]

  Following up on:

http://wiki.metalforge.net/doku.php/user:mwedel:skills

  I've made up:

http://wiki.metalforge.net/doku.php/user:mwedel:skill_classes

  Which goes into a bit more detail on costs - mostly because I got to the point 
where I started to need to know that information to progress on work of the system.

  That is only a first pass (as noted on the page), but I don't see any reason 
not to share it - other folks can make suggestions even at this point.