New package:

    (*) Introduced LArUtil package that includes:
    	- Geometry
	- LArProperties
	- DetectorProperties.
    (*) LArProperites and DetectorProperties provide same functions as LArSoft
    (*) Geometry is almost identical to LArSoft's Geometry but I removed the idea of multiple cryostat and tpc as those aren't relevant to currently running experiments.
    (*) These classes need data file to load constants. This will be provided shortly.
    (*) GeometryUtil will be introduced after that.

-Kazu