Ensure data holder data is XML escaped in the light template
Treat the metadata abstract as ReStructured text

Abstracts in XML metadata retrieved from the Discovery Web Service are
treated as being in ReStructured Text (RST) format.  This is converted
to HTML in the full and KML renderings of a metadata entry.

Interpreting abstracts as RST should not affect existing metadata
other than improve formatting in many cases.  It will, however, allow
future metadata production to take advantage of the formatting
conventions provided by RST whilst still maintaining a human readable
output to the raw XML metadata.
Merge branch 'master' into live-docker