Bug 29526: Add a way for patrons to delete their hold history

Bug 29526: Add a way for patrons to delete their hold history

The same way we have a button to immediately delete the checkouts history in the OPAC, we should have a similar option for the holds history.

This patch implements that.

To test:
1. Have a patron with some old checkouts and old holds.
2. Have OPACPrivacy, OPACHoldsHistory and opacreadinghistory enabled.
3. Notice in the OPAC the patron has some old checkouts and holds.
4. Use the Privacy tab to clean checkouts
=> SUCCESS: They are still cleaned as before this patch
5. Try to clean the old holds
=> SUCCESS: They are cleaned!
6. Add some old checkouts and holds
7. Use the new 'All' button
=> SUCCESS: All cleaned
8. Sign off :-D

Signed-off-by: Barbara Johnson <barbara.johnson@bedfordtx.gov>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
Signed-off-by: Fridolin Somers <fridolin.somers@biblibre.com>