[fix bug 842293] Allow filtering of incomplete profiles in Admin panel.
[fix bug 809481] Do not use hash when username is taken.
[fix bug 842292] Handle incomplete profiles.

Don't index in ES incomplete profiles.
Don't list incomplete profiles in groups.
Don't show profile of incomplete profiles.
[fix bug 844013] Match more characters in region and city listing urls.
Merge pull request #409 from glogiotatidis/844013

[fix bug 844013] Match more characters in region and city listing urls.
[fix bug 827514] Allow sorting users based on country, voucher and is_vouched.
[fix bug 844057] Remove duplicate error message.
[fix bug 844067] Set email field in Invite page to autocomplete=off.
[fix bug 844093] Don't expose invited user emails.
Merge pull request #413 from glogiotatidis/invite

Invite fixes
Merge pull request #408 from glogiotatidis/incomplete-profiles

Incomplete profiles
Merge pull request #412 from glogiotatidis/827514

[fix bug 827514] Allow sorting users based on country, voucher and is_vouched.