removePID: fix removal of IsMuon in HLT1 streamers
Corrects an issue raised in LBHLT-469, among other things:
- removes also the newline and
>>
preceding some instances ofIsMuon
- leaves
IsMuon
in place in the case of monitoring - improves logic in unhandled search within isPIDless
- minor improvement to in-line comments
- use non-default pidless TCKs in the test to avoid clashes with existing TCKs
Edited by Rosen Matev