Add some log statements. Add missing fields to _make_tc_user, and make _make_tc_registration independent of course configuration (for testing)

revised rejected state error message content, markup, and styling on registration's right hand side status area

pearson_make_tc_user: add support for incremental changes, and changes to 'internal' fields for debugging.

pearson registration - changed accepted classes, content, and styling to use the term process instead

pearson registration - revised UI states for reg form, simplified markup for form fields, synched button styles/text b/t registration form and dashboard

switch back to returning json to test_center_register template, and enable jquery handling in template.

fix migrations, removing one field and making another nullable.  Update registration page to allow for editing only demographics.