Update G4AtlasAlg to GaudiConfig2. Add output config.
Rewrite test to accomodate changes.
Add ISF flags. Make "/' style consistent.
Update G4UA to CompFactory.
Remove attempted call to configflag.
Return accumulator, not tuple in G4AtlasTools.
Propagate to tests.

In the BLM geometry configuration:
`DetectorDescription/GeoModel/AtlasGeoModel/python/InDetGM.py`
The BLM geometry is only built if the Pixel and BCM DetFlags are true.
Previously in the sensitive detector configuration the BLM SD was added
if the Pixel DetFlag, regardless of whether the BCM DetFlag was true.

This change commit makes the sensitive detector configuration consistent.
It should fix ATLASSIM-4427.

Patching flake8 warnings and Python 3 compatibility issues in Simulation/G4Atlas/G4AtlasTools package

Added these to G4AtlasToolsConfigNew - which has been configured for
inner detector and LAr so far