new 0.2.15

Hello everybody, we've added several new features to therion - new 0.2.15 source code can be downloaded from http://therion.speleo.sk/download.html According to Wookey's suggestions, following things were added: * new team roles: instruments (insts), assistant (dog) * centerline/centreline syntax * new centerline data items: up ceiling down floor left right ignore (currently all of them are ignored). We need also some abbreviation for LRUD, to be used in *units LRUD metres I don't think that "LRUD" is the best choise. Something like "dimensions" or "walls"... Regards, S.