Underworld

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* Improvements for docker usage.

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New Features:
* Shadow particles sync added.
* Finer solver execution control.
* Added XOR function.
* Can now describe functions using python tuples: fn = (fn1, fn2, fn3)
* Inline interactive visualisation.
* Better handling of systems without rendering capabilities.
* gLucufer Surface renderer resolution setting.
* Parallel and recursive test runner.

Bug Fixes:
* General improvements to stability and error handling.
* MeshVariables can not be used with multiple SLE systems.
* glucifer deadlock when deleting from db in parallel.
* glucifer DB situation where zero compression results in abort().
* glucifer valueRange fix.
* Fn.MinMax parallel fix.
* Issue saving swarms in parallel.

Documentation:
* Big update for User Guide.
* New examples added.
* Examples updated for better usage patterns.
* Updates for docstrings & doctests.
* New & updated build recipes.

Interface changes:
* SLE 'swarm' option renamed to 'voronoi_swarm'
* Conditions can be passed in directly now instead of in lists.
* underworld.help function removed.

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* Pseudo Compressibility python wrapped.
* Neumann boundary conditions for Stokes & SSHeat & AdvectionDiffusion (SUPG!)
* Exposed population control mechanisms. Zero population control now occurs
without using the uw.swarm.PopulationControl object.
* Bug: Potentially critical bug in the integration to material swarm mapping fixed.
* Glucifer/LavaVu graphics 'Store' workflows introduced.
* Dockers upgraded to use ipyparallel where possible.
* Global evaluation for functions (experimental!)
* Exposed non-linear tolerance.
* Deprecated various old interface options.
* PICIntegrationSwarm -> VoronoiIntegrationSwarm
* Viscoelasticity implementation and example.
* 'deform_swarm' context manager for particle relocations.
* Auto-repopulate now occurs for voronoi swarms (except for the uw.utils.Integral class)
* SUPG source terms.
* MeshVariable_Projection method introduced.
* Various bug fixes.
* Various documentation improvements.
* Various testing improvements.
* Various other minor impementations.