Zone:makeEntity() now can accept a fifth parameter, if true it will filter by...

Zone:makeEntity() now can accept a fifth parameter, if true it will filter by generating a probability table with the filter, this way there is no possibility of not getting an item that is possible to get
Rings of invisibility and amulets of telepathy now have a cost to using them


git-svn-id: http://svn.net-core.org/repos/t-engine4@896 51575b47-30f0-44d4-a5cc-537603b46e54