arca astro benchmark added
There are some difference respect to the antares one:
columns order is not the same (I feel that lon,lat and RA,dec is a better order but I can be wrong).
there are zenith/azimuth (but only track directions).
There are only RA-2000, DEC-2000 but no RA,DEC (there definition is less clear?!).
So, let me know if you think this is good to go or you want me to add something.