Update basket only when functional area memberships change.
[fix bug 908053] Fix group member counts in admin.
Add GroupManager that provides member_count.

* Also add total_member_count, full_member_count and
  pending_member_count in Admin Panel.
Beautify GroupAdmin.
[fix bug 980887] Speedup group browsing.
[fix bug 1000938] Proper filtering for group memberships.
Tests cleanup.
Merge pull request #941 from caktus/1005221-ios-tooltip

Fixes #1005221: T-shirt tooltip does not display on iOS
Add django-import-export and dependencies.
[fix bug 980138] Display total number of results found for a search
Merge pull request #922 from glogiotatidis/groupscleanup

Groups cleanup
Merge pull request #939 from matjazv/980138

[fix bug 980138] Display total number of results found for a search
[fix bug 1003875] Add Discouse to external accounts.
Add django-import-export support to admin panel.
Merge pull request #936 from glogiotatidis/importexport

Add django import-export.
[fix bug 1007567] Reset vouch metadata when is_vouched=False.
Merge pull request #943 from glogiotatidis/1007567

[fix bug 1007567] Reset vouch metadata when is_vouched=False.
[Fix bug 1005221] restored z-index