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Main revision of Mantid Workbench release notes for v6.4.0

* Avoid overflow in intermediate calculations

* Uneeded cast

* Simplification

* Check intermediate values for overflow

* Cast after to avoid rounding

* Test inversion of large matrix

* Use intermediate variable

* Missing include

* Missing namespace

* Missing include

* Check for overflow before

* Uneeded check

* Missing check on acosh parameter value

* Avoid C4244 warning on MSVC

On MSVC, `long double` is mapped to `double`. Conversion from `size_t`
to `long double` is then causing a warning.

* Redundant type

* More compact code

* Release note for tridiagonal matrices inversion

- Added missing words and fullstop
- Added missing formatting
- Added link to Superplot documentation

Expose `getNumberDetectors` to python

Tidy and Revise v6.4 SANS Release Notes

Tidy and revise 6.4 Framework Release Notes

Change default scaling in INTER and OFFSPEC IPFs

Replot resolution data in ISIS calibration when instrument changed

Remove as many `QT_VERSION_CHECK`'s as possible

re: #33872

RE #0
Co-authored-by: Rob Applin <robertapplin@users.noreply.github.com>

RE #0

Fix unhandled exception if user file not found

Fix Cannot Set Axes to Log from Double-Clicking Axes

Fix Mantid crash on saving big project

RE #0

RE #0

RE #

Refs #0.

Refs #0. Exposing this piece of functionality to fix an MSlice bug.

this commit disables the range selector signals in isiscalibration before the default instrument resolution is set.

re: #33872

Pinned version of numpy

Change GroupBySampleChangerPosition to give no text for no samp_posn

Main revision of Diffraction release notes for v6.4.0.

- Expanded on notes where necessary
- Amalgamated release notes relating to matplotlib v3.5 changes into a single note
- Added release notes that had been included after the switch to manual release notes and moved those files into Used folders as appropriate
- Added links
- Added an image for the the new cut viewer tool in Sliceviewer
- Spelling and grammar check

Co-authored-by: thomashampson <thomas.hampson@stfc.ac.uk>

This commit fixes a bug where errors are not being handled correctly if a user file entered in the table in the SANS GUI cannot be found. Strangely, exceptions are caught and handled but normal errors are not dealt with, and there is an assumption that the "states" object contains valid values, which it does not, so when the code attempts to access it it causes a "tuple index out of range" error.

I've added some code to check for errors and handle these in the same way as exceptions. It might be that the current exception handling is no longer required but this needs further investigation and is beyond the scope of this PR.

I've also improved the error message to use the entered user file name rather than the full path, because the latter is empty if not found so the error is not useful.

Re #33962