add the alltoc.html template
Conf file changes:
* enable TODO plugin
* render sidebars
CSS tweaks
* Center images
* reduce h3 size
* todo box red color
Manual review of guides:

- cluster_guide
- host_guide
- hostsubsystem
- cloud_auth
- cloud_view
- suns_auth
- suns_views
- sunstone
- accounting
- chmod
- manage_acl
- manage_users
- quota_auth
- template
Merge branch 'master' of github.com:OpenNebula/docs

Conflicts:
	source/_static/opennebula.css