pypima/pima.py: Be more verbose.

Print message on calibration information successful load.
pypima/pima.py: Add `ivs_name` parameter to ...

... the `station_list` method. If `ivs_name` is True (default) return
IVS names else 2-letter station code.
pypima/raexperiment.py: Modify `_fix_antab`.

Comment out TSYS records in the ANTABs for the stations not listed in
the input FITS file.