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In propagate: fix call to scipy.misc.pilutil (now just scipy.misc). Replace the apodize method with an algorithm that is more reliable and MUCH easier to understand. Old'n'busted method still available as apodize_old.

In gpu: fix oversight which left context, queue etc unavailable to child instances of gpu.common

In io, fix default for append_component option

In xpcs: can now use the gpu for g2 calculation if gpu_info is supplied. This gives a big speed up particularly for large tau and large q area.
xpcs: clear out some old timing code
In phasing:
	1. remove old richardson_lucy docstring
	2. alter __init__ to accept an existing gpu context
	3. change padding of support to help with display selection
	4. add scale option to rftf so that its range is now (0,1)
	5. update rftf docstring

In interfaces: consider this the first live commit of the xpcs_backend and imaging_backend

In webapps: first live commit of the analytical front-ends and the flask_server which links http requests to backend jobs
Clean up imports, increment version number to today's date.

In webapps, remove default values from parameter fields. Fix "recalculate on change" bug.