Re #8338. Fix rarely-run system test.

The property type was changed to boolean in #8266.
Refs #8337 Add system test to check this use case.
Merge remote-tracking branch 'origin/bugfix/8338_PG3StripPeaks_systemtest'
Merge remote-tracking branch 'origin/bugfix/8337_fltabs_error_some_inputs'
Merge remote-tracking branch 'origin/master' into feature/7732_Load_Save_Ascii_Multiple_Spectra
Refs #7732 adding a setting to HFIRTestsAPIv2 to see if it cleans up the mess.

Added the NoSaveIq() setting to the reductions in HFIRTestsAPIv2 to see it that stops it leaving fiels around. Not totally sure if this will work as i can't see if the test requires those files or not.