Collect pointing information #60
Description
During exposure readout, collect the RA/Dec and Alt/Az of the pointing of the telescope. This can probably be done by issuing a ReadScopeDestination to the SiTechExe server (see protocol). The command should return the RA/Dec and sidereal time with which it's possible to calculate Alt/Az, hour angle, and airmass.
Include all those values in the headers with appropriate comments.
The connection and querying of the server is similar to the filter wheel server. See the filter wheel functions in the code. Alternatively (and probably better) we can use the f1-tcs HTTP server which already implements some of these features, but maybe not all of them.