Bug 22765: Add class beside loggedinusername to indicate if logged in user is a super...

Bug 22765: Add class beside loggedinusername to indicate if logged in user is a superlibrarian

It would be useful to know if a logged in user is a superlibrarian for the purpose of customization
using Javascript and CSS.

Test Plan:
1) Apply this patch, restart all the things
2) Log in as a superlibraraian
3) Note the new class 'is_superlibrarian' next to the 'loggedinusername' class
4) Log in as a non-superlibrarian
5) Note the new class is not present

Signed-off-by: Barton Chittenden <barton@bywatersolutions.com>
Signed-off-by: Liz Rea <wizzyrea@gmail.com>
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Nick Clemens <nick@bywatersolutions.com>