__init__ MamboMBFits:
MamboMBFits.py
DES: Instanciation of a new MamboMBFits object. INP: (str) mamboName = name of the Mambo file (str) mbName = name of the MB-FITS file in both cases, the .fits extension is appended if not present HIS: FS041210 also handle names that already contain .fits