PALpy Version 1.2

• Include PAL v0.6+
• Include ERFA v1.1.1
• Submodules now use explicit https URLs to make them more robust
  (especially when forking the repo) (thanks to Srini Chandrasekharan).
• New interfaces added: altaz, dmxv (thanks to Srini Chandrasekharan
  for those 2), dav2m, deuler, dmxm, dimxv, dm2av, dvn and dvxv.
• Some routines now have "Vector" forms to allow numpy arrays to be
  given as arguments and to return numpy arrays with results. This
  provides a signficant performance enhancement over looping in
  Python code: aopqkVector, de2hVector, ds2tpVector, mapqkVector,
  mapqkzVector, pmVector (Thanks to Scott Daniel for these).
• Explicitly include GPLv3 text in distribution.
• New routine palvers() can be used to obtain the version
  information of the underyling C PAL library.
• Python docstring documentation is now included for all
  palpy routines.