Whitespaces in CSV headers result in node for itemset doesn't exist error

[yanokwa]

If you have a select_one_from_file data.csv question in a form and the attached data.csv has a name header with a trailing space, Collect will fail (and Enketo will succeed).

Good: list_name,name,label
Bad: `list_name,name ,label

We should probably do as Enketo does and remove all whitespaces from names. We should also see if Enketo trims values as well and consider standardizing on that behavior.

[lognaturel]

It looks like JR trims whitespace for XML values but not CSV values: https://forum.getodk.org/t/unable-to-see-data-entered-while-editing-a-record/42286