Requirements for mri_parameter_form should be documented

[driusan]

Some places in the code (statistics, qc module off the top of my head) make assumptions about an instrument named "mri_parameter_form" being collected, and that that instrument has columns which match the scan_type table such as T1W_Scan_Done in order to assess whether the data should be there.

These requirements/assumptions should be documented (and perhaps the form turned into a module of some sort instead of an otherwise plain instrument.)

[stale]

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