Changed method to modify time units in cmorization. Changed check inside renamevars from ncdump to cdo showvar because it can detect more errors. Fixes #2

Conflicts:
	earthdiagnostics/ocean/interpolatecdo.py

Added diferentiation for sic coming from IFS or LIM. Added support for this in Variable and cmorizer classes

Changed path for the moved files when move_old is active when linking. Added move_old option to relink diagnostic