PHOTDM 1.1 WD

Update for PhotDM 1.0

Editor : M.Louys

This update reformulate the existing classes of PhotDM 1.0 to be compliant with the VODML representation rules.

• attributes simple types are now based on the VODML ivoa:types.
• import of VODML ivoa: template
• deprecates the use of Physical Quantity class , whose granularity does not fit the one adopted in VODML.