Add link for UniversalEditButton to header

[NilsLindenberg]

(One of) The wiki-standards group(s) has launched the Universal Edit Button (more info:  http://universaleditbutton.org/).

Similiar to the RSS-Autodiscovery, it shows a little icon in the address-bar if

<link rel="alternate" type="application/x-wiki" title="Edit" href="EDIT-URL" />

is added to the header.php, taking into account:

1) it should only be added if a page is shown(?) 2) the user must have write_acl 3) the url must take rewrite_mode (on/off) into account

(notice: UEB is only supported by firefox [via plugin])

[DarTar]

just how ugly that icon is :(

[NilsLindenberg]

But see the list of engines already supporting it. Besides, one additional line in the header won't bother people not having the plugin installed.

[NilsLindenberg]

(In [1155]) closes #779: Add link for UniversalEditButton to header

[DarTar]

nils what abour porting this to 1.1.6.6 ? that would allow to get it out soon.

[NilsLindenberg]

proting to 1.1.6.6

[NilsLindenberg]

(In [1187]) closes #779: Add UniversalEditButton link to header template