update calfits.py
update calfits.py

removed code pertaining to uvfits_required_extra.

updated header parameters and added extra parameters for write.
creating new hdu for the flags since they are always have nfreq dimension (even in delay).

HERA-Team/pyuvdata,HERA-Team/pyuvdata,HERA-Team/pyuvdata,HERA-Team/pyuvdata