omnibus patch for Patron Self-Registration improvements

[Jason Etheridge]

This covers (solves or dissolves) the following bugs:

Option to Hide Requested Username on Patron Self Registration Form
https://bugs.launchpad.net/evergreen/+bug/1951013

Example DOB field can break for self-registration Edit
https://bugs.launchpad.net/evergreen/+bug/1860719

Self-registration DOB validation regex is too lax, should only allow '-' separator
https://bugs.launchpad.net/evergreen/+bug/1774253

Self-registration: system accepts wrong DOB format
https://bugs.launchpad.net/evergreen/+bug/1814150

From the release notes:
 * For patron self-registration, improves styling and accessiblity and adds the following library settings:
   ** 'Hide Username field in Patron Self-Reg.'
       Hides the Requested Username field in the Patron Self-Registration interface.
   ** 'Patron Self-Reg. Date of Birth Order'
       The order in which to present the Month, Day, and Year elements for the Date of Birth field in Patron Self-Registration. Use the letter M for Month, D for Day, and Y for Year. Examples: MDY, DMY, YMD'

I'll post the branch once LP gives me a ticket number I can update the commits with.

[Jason Etheridge (phasefx)]

Top 6 commits at collab/phasefx/lp2065448-patron-self-reg-omnibus
https://git.evergreen-ils.org/?p=working/Evergreen.git;a=shortlog;h=refs/heads/collab/phasefx/lp2065448-patron-self-reg-omnibus

[Seth Erickson (serickson74)]

I have tested this bugfix and sign off.