Bug 3137: HideFieldsPatronAddForm syspref

Bug 3137: HideFieldsPatronAddForm syspref

This patches adds a syspref - HideFieldsAddPatronFrom - that controls
which fieldsets are hidden by default in the add patron form.

To test:
1) Apply patch and update database
2) Go to System preferences and confirm HideFieldsPatronAddForm has no
fields selected
3) Go to add a patron / edit an existing patron (any patron category).
confirm everything still works as expected.
4) Tick some of the fields in the syspref to hide them in the form
5) Go back to add patron form.
6) Confirm these fields are hidden and listed at the top of the page
7) Toggle the checkbox and confirm the hidden fields show or hide as
expected.
8) Go back to the HideFieldsPatronAddForm system preference and ensure
the Main address option is checked to be hidden
9) Go to the patron's details page
10) Click to edit the Contact Information section
11) Confirm the Main address option shows and the checkbox to show
hidden fields is not present.
12) Confirm you can click the legend of each section to show and hide
sections

Sponsored-by: Catalyst IT
Signed-off-by: David Nind <david@davidnind.com>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>