Allow ability to read/convert ecliptic/galactic coordinates from par file
Some .par
files just contain galactic (BETA/LAMBDA) or ecliptic (ELONG/ELAT) coordinates rather than RAJ/DECJ. I should add the ability to read in such values and convert to RAJ/DECJ - this can be done using astropy (or whatever PINT uses for its as_ICRS()
method.