Web bugs march14th (rebased onto develop)



This is the same as gh-891 but rebased onto develop.

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This fixes a couple of issues:
 - Appearance of scripts in the web scripts menu. Web should now show the same scripts as Insight, in the same order and with ... instead of .py.
 - Minor Blitz Gateway bug - see https://trac.openmicroscopy.org.uk/ome/ticket/10519 for code example to test.