Remove display of patron birthdate, internet access level, etc

Remove display of patron birthdate, internet access level, etc

These fields in the staff client are either not applicable or
potentially privacy-invasive or both. If the data somehow does
get into the system, we don't want it to show up on the staff
client anyway - and we don't want annoying warnings about unset
dates of birth, etc.

This is the hardcore way of doing things, we really should make
it yet another configuration setting. Oh well.

Signed-off-by: Dan Scott <dscott@laurentian.ca>