Add three field link support

ananelson requested to merge ananelson/dataprocessor:master into master

I very quickly ran into an example where a three-field link was desired (in this case, contact ID, case ID, and case subject to make a link to the case with the subject as link text). Here is the code, very similar to two-field case. Also tweaked the formatting of two-field form to be consistent with package standards.

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