changed test-deriv to use inf/-inf by default
changed test-deriv to use inf/-inf by default

tmbdev/clstm,kba/clstm,tmbdev/clstm,kba/clstm,MichalBusta/clstm,jbaiter/clstm,tmbdev/clstm,amitdo/clstm,jbaiter/clstm,MichalBusta/clstm,jbaiter/clstm,kba/clstm,MichalBusta/clstm,amitdo/clstm,jbaiter/clstm,amitdo/clstm,kba/clstm,tmbdev/clstm,MichalBusta/clstm,amitdo/clstm