refs #8687 Minor change allowing to process legacy parameters

in dgreduce subsequently in the same script.
refs #8687 No changes, lazy push
refs #8578 Fixed unit test DgreduceTest
refs #8578 Should fix the issue
refs #8578 fixing some weird brunching error

which cause unit test to fail.
Merge remote-tracking branch 'remotes/origin/bugfix/8578_storedPythonParams' into feature/8640_restore_loaddetectorinfo_removal
refs #8640 Minor improvement to ScaleX algorithm description.