Moved cross exec of prognostic variables from cross.cxx to fields.cxx (needs to be extended to thermo, boundary, ..)
Added option for output of fixed profiles (e.g. reference pressure)
Setup of timeseries. Not yet tested
Merge remote-tracking branch 'chiel/stats' into thijs
Remove debug statement
Merge remote-tracking branch 'bart/newcross' into masterupstream

Conflicts:
	src/fields.cxx
	src/model.cxx