Some split types don't work for analysis users due to SAM username-in-dataset-name rules
Some split types base the name on the existing dataset with a suffix, etc. (original_slice0_files4, from original, etc).
However SAM only lets normal users create definition names that have their username in them. So we need to review
all the split types and make sure they create names with the launching username in them.
In the meantime, we need to tell analysis users to create a new definition with their username in it to use for their POMS jobs.
samweb create-definition $USER_original defname:original
to use as the basis for their splits.
This may take a little rework in the code to fix properly, at the moment, I'm not sure the split type code can easily tell
what the username for this launch is, so we may need to pass parameters in through a few layers of code.