Merge branch 'master' into swift-velociraptor-C

.gitignore

INSTALL.swift

configure.ac

doc/Doxyfile.in

doc/RTD-Legacy/DeveloperGuide/AddingTasks/addingtasks.rst

doc/RTD-Legacy/DeveloperGuide/Examples/Cooling/cooling.rst

...veloperGuide/Examples/ExternalGravity/externalgravity.rst

doc/RTD-Legacy/DeveloperGuide/developerguide.rst

doc/RTD-Legacy/FAQ/index.rst

doc/RTD-Legacy/Innovation/AsynchronousComms/index.rst

doc/RTD-Legacy/Innovation/Caching/index.rst

...nnovation/HeirarchicalCellDecomposition/InitialDecomp.png

...cy/Innovation/HeirarchicalCellDecomposition/SplitCell.png

...cy/Innovation/HeirarchicalCellDecomposition/SplitPair.png

...Legacy/Innovation/HeirarchicalCellDecomposition/index.rst

doc/RTD-Legacy/Innovation/HybridParallelism/index.rst

...RTD-Legacy/Innovation/TaskBasedParallelism/OMPScaling.png

...D-Legacy/Innovation/TaskBasedParallelism/TasksExample.png

...Innovation/TaskBasedParallelism/TasksExampleConflicts.png

doc/RTD-Legacy/Innovation/TaskBasedParallelism/index.rst