develop branch build fixed - please update your topics if you want to build spikes

A Jalview desktop XML parsing dependency snuck in to code required by
the applet in the 'great colourscheme refactor' so builds were failing.
Have patched - see JAL-2360 for commit.

j.

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Dr JB Procter, Jalview Coordinator, The Barton Group
Division of Computational Biology, School of Life Sciences
University of Dundee, Dundee DD1 5EH, UK.
+44 1382 388734 | www.jalview.org | www.compbio.dundee.ac.uk