Expose pointing table from metafits

[gsleap]

Some metafits files will have a pointing table which would be necessary for some preprocessing.
See:

[cjordan]

What do you mean by pointing table? Sweet spots?

[andreww5au]

The new code to generate metafits files for MWAX to use internally includes an extra HDU in the metafits file that has alt/az/distance information calculated for the pointing centre every 4 seconds, for the duration of the observation. Brian's code will interpolate and use that data for fringe stopping.

[cjordan]

Thanks!