Flips D22 and D33 detector pixel numbering

Fix sliceviewer for matplotlib 3.1

Fix settings test for python 3 in windows

Expand ISIS reflectometry system tests

Remove Confusion from SaveNISTDAT example 

Create total scattering pdf rebin output

Windows: Fix switching between Python 2/3 without clean

Also uses fin_package rather than handwritten code to find
Python libraries so unsetting code works as expected.

I've added the link back in as the saveNISTDAT_data.nxs file was already in the DocTest data file and had just been removed from the usagedata so this was the simplest thing to do. This file is now in the UsageData

Fixing crash with fit constraints in the Muon Analysis 2 GUI

Also fixes behaviour where deprecated functions actually
no longer did what they used to do.
Refs #27736

Allow switching between Python 2/3 without cleaning CMake configuration

Add option to set PDF type on polaris create_total_scattering_pdf

The attribute has become readonly in matplotlib 3.1 and setting
it raises an AttributeError. It is unused anyway and a hangover
from old code.
Refs #27736

Controls whether the build is against Python2 or Python3.
CMake checks have been introduced to flush out old variables
if a previous build was against a different python major.minor
version.

re #27554

MSVC was using PYTHON_{MAJOR,MINOR}_VERSION which was
out of step with the FindPythonInterp module.

In python 3.8 it calls __index__ when an int is called but in older versions it calls __int__ so a version check has been added to the test.

Fixes Arising from V20 Experiment

Use the longest form of a filename as ws name for drag drop

This commit corrects typos in the ISISPowder-Polaris documentation, It also replaces a print statement in Polaris with a logger.warning.

This gets the longest version of the filename without the extension

Avoid new implicit float to int conversion warnings in Python 3.8

Fix show detectors in workbench with Python 3

Python 3.8 deprecates implicit conversion from float->int and
warns on it. We simply force the conversion explicitly
Refs #27717

27571 d33 usage example

In Python 3 map returns a generator and these cannot currently
be passed over the C++ boundary.
Refs #27712

Refs #27712