adapt Fieldgenerator to take a player.t list as argument instead of nbplayers, also, unit id and p_id are ints not strings
Merge branch 'generation' of https://github.com/GL-MPRI-2014/GL_MPRI_2014
Coherence with generation changes
Merge branch 'master' of https://github.com/GL-MPRI-2014/GL_MPRI_2014