Increase allowed bounds for range markers in IDA

Miscellaneous updates to the docs

Merge pull request #31503 from mantidproject/31339_migrate_extending_mantid_with_python_to_user_docs_2

Migrate Extending Mantid With Python To User Docs 2

Fix gap in validation on the Energy unit

Lots of spelling/grammar corrections and style changes

Muon Analysis - Better validation of start and end x

Remove Qt usage from Framework plotting

This was causing a crash in one of the MARI scripts due to a spectrum
without any detectors not being masked in a call to ConvertUnits
Also tighten up unit tests on the validations applied on various units
GetAllEi wasn't supplying an L2 value when doing an energy unit conversion
because it stuffs L_tot into the L1 field. Have supplied an L2 value of 0
here to avoid the new validation logic on the Energy unit

Stop Plot Window From Disabling When New Data Is Loaded Muon Analysis

Prevent show full function resetting fit in indirect data analysis

Update Downloads image
Emphasise that contact info is required in Error Reports
Improve examples of Loading lots of data with symbols
Reformat to align bullet points
Add comment to look for .txt user file for SANS although .TOML is now the default

Update DiffractionFocussing docs to include TOF unit as allowed but deprecated

Also clarify the scope expected in the Core Manual testing for SV

Resolves user issue on forum

Autoscale and tile plots in muon analysis

Overlay peaks when slicepoint doesn't change to fix crash when peak ws replaced and representations cleared

Support IN16B's single detectors in IndirectILLEnergyTransfer

Fix broken batch button from 76fac4a5