Pull in latest fixes for mslice from external repository

Merge pull request #27303 from mantidproject/27291_make_elemental_analysis_produce_histogram_ws_for_plotting

Convert output workspace from elemental analysis to histogram

Update Release Notes v4.2 Step2

Update Release Notes 4.2

Fix figure options on matplotlib v1.5 - RHEL7 only

Move file loading and processing async in SANS

Update HB3A IDF, correct 2theta direction and panel positions

Add check on qt version to disable docking in I(Q, t) fit tab browser

Add back event slices tooltip

- Deletes cut workspaces after an interactive cut has been made. Avoids them building up in MantidPlot/Workbench.
- Fixes some minor issues uncovered in unscripted testing

Accept spec nums other than 4 or 5 for SANS Monitor

Fixes the progress bar not restting it's own progress. This causes it to
continue beyond the bounds of the bar which caused Qt to randomly change
percentage or not update at all

Add back event slices tooltip which got lost in the re-layout of SANS
settings

Accept spectrum numbers other than 4 or 5. LOQ, for example, uses a
spectrum number around 17000 for their offset, which internally is
mapped to monitor 4. The exception is ZOOM which also can use monitor 5,
however it is (currently) the only instrument using spec 5 so a simple
check will suffice

Modify registerFeatureUsage in usage service to reduce misuse

Switch to custom python2-qt5-devel for RHEL

fix plotting multiple single spectra workspaces

Log Xvfb errors to a file

It is no longer used.

Add checks for if the properties exist and hide the ones that don't work from the gui

Convert some more legacy strings to new feature name format.
Correct a couple of namespace issues - the alias UsageService (representing UsageServiceImpl)
was confusing me because I thought it was Mantid.Kernel.UsageService namespace

Keep interfaces above workbench when plot is loaded

Fix meaning of wavelength_spread in HFIRSANS2Wavelength

Restore functionality to the home button