Added fix for python2 regex

Fix for python2 attributeError instead of TypeError on login with wrong openLDAP setting
Added default empty string on LDAPCertificate
Fix ldap as scheme for tls connection
Enabled add user on LDAP Authentication
LDAP config port is now number input
Added header for user import config
Added python ldap version to about section
Fix: It's no longer possible to login via fallback password as long as LDAP server is available
Fix: TypeError on bind is now catched and transformed to error message
Update Readme
Fixes for ldap

cps/templates/admin.html

@@ -35,9 +35,8 @@
           {% endif %}
         {% endfor %}
       </table>
-      {% if not (config.config_login_type == 1) %}
         <div class="btn btn-default" id="admin_new_user"><a href="{{url_for('admin.new_user')}}">{{_('Add New User')}}</a></div>
-      {% else %}
+      {% if (config.config_login_type == 1) %}
         <div class="btn btn-default" id="import_ldap_users" data-toggle="modal" data-target="#StatusDialog">{{_('Import LDAP Users')}}</div>
         <!--a href="#" id="import_ldap_users" name="import_ldap_users"><button type="submit" class="btn btn-default">{{_('Import LDAP Users')}}</button></a-->
       {% endif %}