re #8156: getFilePathFromWorkspace test coverage
LOQSANSUtilityTest: make path system independent

Windows uses backslashs for path, change it to forward slashes before
comparing paths.

re #8156
LOQSANSUtility: correct problem with MAC OS

I do not quite know why, but Mac is reporting that the file was saved as
-ADD. So, it checks to change that, because, it does allow to load the file
with that name as well.

re #8156
LOQSANSUtility: complete correction MAC OS

python string::replace returns the string, does not modify the input.

re #8156
Merge remote-tracking branch 'origin/bugfix/8156_assign_processed_data'