XMM processes can't handle there being '+' values in path names

[DavidT3]

This is a lesson I learned in XGA, and should have remembered, but if an archive name has a '+' in it, then SAS tools are going to fall over.

Found this out because I made an archive for a single cluster and called it 'PLCKG165.7+67.0' - don't know how I will handle this yet.

It manifested itself in the processing getting through to the 'espfilt' stage, and then having no successful 'espfilt' runs because it couldn't read the dataset:

** evselect: error (datasetCouldNotBeRead), The dataset with name '/Users/dt237/projects/assorted_small_results/megan_g165_cluster/daxa_output/archives/PLCKG165.7' could not be read;