1.0.0 2011-12-14: initial version 
1.0.1 2011-12-15: bugix release
1.0.2 2012-01-11: return NetCDF/NArray (optional)
1.0.3 2012-01-17: bugfix for NArray return values
		  remove chainCall method - can be replaced by setting :in
		  speed up by reuse operator list instead of computing it
		  every time
