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

Made detector names consistent

Changed step values to update correctly

Also changes the initialization sequence so the settings aren't read in
until the widgets are created. Now any widget in main window that
supports saving and loading from settings will do so automatically.

This reverts commit d6f792e4.

Disable tests on macOS until a solution can be found

The recent copyright update made them unusable.

Implementation of Voxels in Mantid as GridDetector

Fix bug with saving WISH data to Isaw format

Allow SANS systemtest to be run on Ubuntu

Le bail fit concepts