Python module to handle Astronomy Visualization Metadata Standard

 PyAVM is a module to represent, read, and write metadata following the
 Astronomy Visualization Metadata (AVM) standard.
 With pyavm you can:
  -Parse AVM meta-data from an existing image.
  -Access and Set the metadata.
  -Create an AVM object from scratch.
  -Convert to a WCS object.
  -Initialize from a FITS header.
  -Initialize from a WCS object.