Improve peak fitting

Fix custom user docs stylesheet for Sphinx > 1.6

Fixed exception in instrument view.

Added Eclipse Documentation .rst

Refs #0

Re #23040

Fix error reporter not reporting to database

Check for whitespace only strings

Re #23056 Change error message

Prevent crash from removing non-existing layer

Switch to pure C implementation for other instance checks

Fix crash in Muon TF Asummetry

Fix unhandled exception SliceViewer in Non-orthogonal mode.

Fix validateInputs crash on WorkspaceGroup

TOFTOF GUI: improve save reduced data options

gcc 4.8 seems to have trouble denoting the correct type when using
uniform initialization with QStringList.
Refs #0

Fix warnings with GCC 7

Merge pull request #22955 from mantidproject/22913_MakeGetMemorySizeInGroupWorkspaceReturnCorrectAnswer

WorkspaceGroup->getMemorySize() now returns actual size instead of 0

Re #23040

Changed linking method to match other pages

Re #23040

This commit removes the validation error for workspace groups which results in an error shown on the GUI. Instead validation is skipped for group workspace inputs to the efficiencies workspace property. The reason for this is that validateInputs is not called when the algorithm is run from a script. Therefore we get the same behaviour from the gui and the script, where the algorithm will be called on each member of the group initially. This could be improved further but is out of scope of this PR.

Re #23061