Set MC channel number as string in TagInfo Fix AGENE-1933
TagInfo is only caught my the CountHepMC corrections in sufficiently long jobs (multiple input files?). Hence the original tests never caught that the TagInfo mc_channel_number entry is a string not an integer. This caused an exception to be thrown when CountHepMC tried to update a string with an integer type.
This update tries updating TagInfo's MC channel number field with a string first. Should that fail ti will try with an integer. Should that also fail it will print an ERROR and continue merrily on its way.