mod_acl_adminonly: fix, set_admin is not exported by z_acl
mod_admin/mod_admin_frontend: made admin more responsive. Added first version of frontend editor based on mod_admin.
mod_admin: fix '&' in doc description as it crashed the doc generation.
mod_admin: fix body top padding for smaller screens.
mod_admin: Make the modal popup in the admin_frontend as wide as in the admin.