Fit peaks system tests

Help window from python

The test works as expected

Change IDF name mangling to use SHA1 rather than last modified date

Conflicts:
	Code/Mantid/Framework/PythonInterface/plugins/algorithms/WorkflowAlgorithms/IndirectILLReduction.py

Refs #11758

quantify code coverage

Coverity null pointer dereferences in MantidPlot

Improve multiple file logging in indirect calibration and resolution

Add FABADA option to I(Q, t) fit and ConvFit

Conflicts:
	Code/Mantid/MantidPlot/src/MatrixValuesDialog.cpp
Re #11828

Change SensorA as default log in IDA.ELWIN for BASIS

Coverity issues: Muon and NeXus load issues

Estimate peak background fixes issues in FindPeaks with FindPeakBackground.  The failure in windows build is not related to this ticket. 

Fix plotting issue on IDR

Fix "uninitialized..." coverity issues in MantidPlot component