Replacing lots of things with qtpy and abstracting off the backend
running in matplotlib

This is a duplicate of the one in mantidqt and should go away.

Refs #23762

Speedup DateAndTime construction

Declared some boost::regex variables as 'const static' so they will be
initialized at startup. This should give some performance boost as shown
by the new DateAndTime performance test.

Re #0

Add unicode support to loggers in py2

Conflicts:
	qt/applications/workbench/workbench/plugins/workspacewidget.py

IndirectFitData Unit tests

Refactor install dependencies for linux

Fix class descriptions in Python API documentation

Expose setConstraintPenalty to python

Indirect - Move the run button in Data Corrections and disable when running

Project Recovery: Add lock file whilst saving

Add custom interfaces to workbench menus

Fixed muon thread model so it no longer crashes

This adds the code for introspecting the python interfaces, adding them
to the menus, and launching the interfaces. Converting the interfaces to
work in qt4/qt5 compatibility is a separate PR.

Adding plotting options to the muon plotting

Indirect - F(Q) - Change the allowed Fit Types depending on the selected parameter

It seems that the `&` character in the `Info.plist` causes on OSX Yosemite causes MantidPlot
to hang on startup.

Updated SolidAngle so that it would be correct when using StartWorkspaceIndex

Add flood correction to RROA

Save message window log level in user settings

This separates the mantidplot and mantidworkbench dependencies into
different branches. It does the same thing for (ubuntu) python2/3
dependencies. Ubuntu 16.04 is now specifically checked for with all the
other newer ubuntus being considered default. Also did significant
changes to ubuntu requirements to form them more closely to how rhel
requirements are.