fixes #7009, N+1 (actually 6+1) queries in dashboard page

fixes #7082 - combo box style in host multi-select popup windows

Fixing the combo-box style in app/views/hosts/select_multiple_* pages.
Using selectable_f from app/helpers/layout_helper.rb instead.

Fixes #6756 - exposes vmware resource pools and folders through the API

Fixes #6608 - expose disk usage info through available_storage_domains API

fixes #7061 - show file upload when template is not locked

Fixes #3285 - extract 'Host' on reports page for trans.

Fixes #6400 - Show * next to required form fields

fixes #6964 - replace default scope that hides users with explicit scope

Fixes #3300 - extract translations on new smart variable page

Fixes #5734 - API for external groups management