Bug 19793: Add a field for email in batch patron modification

Bug 19793: Add a field for email in batch patron modification

This adds the email field to the patron batch modification tool.

To test:

1) Install patch
2) Open Batch Patron Modification tool, and input a borrowernumber to edit
3) Add some data (e.g. test@foobar.com) into the Email address field, and click Save
4) The Primary Email address in the user record should now contain your email address
5) Test that running the tool again with the option to delete the data clears the field correctly
6) Repeat steps 1-5 with a file of user borrowernumbers

Sponsored-by: PTFS Europe
Signed-off-by: Sal <sally.healey@cheshiresharedservices.gov.uk>
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>