Bug 11375: (follow-up) Add links to show all/hide all

Bug 11375: (follow-up) Add links to show all/hide all

This patch adds links in the toolbar to show or hide all
sub-permissions.

To test, apply the patch and view the permissions page for a patron.
Clicking the "Show all" or "Hide all" links should work to show or hide
all sub-permissions. The corresponding "Show details" and "Hide details"
links for each permission set should be correctly toggled.

Signed-off-by: Maryse Simard <maryse.simard@inlibro.com>
Signed-off-by: Josef Moravec <josef.moravec@gmail.com>
Signed-off-by: Nick Clemens <nick@bywatersolutions.com>