Issue #94: user administration improvements

e-mail sent to the administrator when a new user signs up should clearly state that his action is required to activate the account
a link to the activation page should be present
the web interface would ideally contain an easy way to activate one or multiple accounts, ideally by clicking one button and not requiring to 'edit' each account individually. A 'activate all non-activated users' button could also help here.

Kallithea issues archive