Re #18108 Merge master into branch

Override skipTests method to make sure that there is a proper version of numpy and Python in a system.

Skip tests where numpy.einsum is unavailable.

Abins 0.1: Correct check for a DFT  file extension.

Coverity fixes for crystal field physical properties code

X and Y attributes for tabulated function.

Imaging GUI: Merge the Run and Setup tabs

Fix building qthelp and html docs using python 3

Rewrite SaveOpenGenieAscii to save valid files

Respect BUILD_PACKAGE variable if specified by Jenkins

Fix bug seen when remote directory not in data search path

Check variable is defined before using it

Fix parameter check and assignment

Indirect ILL Reduction: system test quick fix

Add event handling to the reflectometry (polref) GUI