Add documentation page for Multi-dataset Fitting

re #1

IN16B QENS: relax too strict error

Reduces the execution time. Both folders contain adequate numbers of file types to test so testing both seems excessive.

Remove newline chars in the script builder when writing history

Allow loading of logs after duplicate detected

Remove "Send cluster" in reduction UI

Added the option to load NX 5 extension

Fix MAUD warning on Mantid start

Changed save extension to .h5 

Add images to release notes

Removed beam centre finder Q limits Updated user file parser 

Re #22963.

Added images to sans and refletometry release notes

Sans usability fixes

MWRunFiles : launch file finding also with empty string

Indirect Data reduction use the same syntax as GroupDetector algorithm