Using the place holder @MEDIA(<mediaid>)@ you now can directly embed
images from the media repository into your HTML mail template.

An example was added to the mailwrap.html, but because images are
embedded as is (no prescaling) this is suboptimal. If we keep it, a
smaller version of the DokuWiki logo should be shipped with DokuWiki.

The mailwrap.html adds the standard headers and footers to all HTML
mails. The signature present in the text body will be removed before
inserting in the wrapper, allowing a nicer footer for HTML.

Users can overwrite the file with their own to create HTML mails in
corporate design. However, a way to automatically embed referenced
images is missing currently.

Conflicts:
	inc/auth.php

de/de-informal language updates / fixed using mailprefix in registration and password lost notifications

It now uses inline diff format for diff HTML mails

With this change it's easy to just set the replacements for HTML that
need special attention.

This method makes it easy to send a HTML mail based on the default text
mails. This is probably enough for simpler mails where no sophisticated
HTML is needed except a bit of formatting and linked URLs.

it now passes the whole Mail object and also signals if the mail sending
was successful to the AFTER event. A bunch of references should make it
compatible with old plugins.

this should make it easier to reintroduce a plugin hook compatible with
the old one

fixed resizing mediamanager panels in Chrome using browser sniffing (FS#2351) - any better solution welcome

Changes to plugins cascade for FS#2359

renamed plugins.protected.php to plugins.required.php and added it cascade to allow overwriting as a local protected file

pt: paraphrased '<' character in some language files to avoid XML errors

as per commit 34bc7405

paraphrased '<' character in some language files (en, de, de-informal) to avoid XML errors -- please fix other languages

re-added font-size to .ui-widget of jqueryui theme to make programmatical removing of font-family easier

fix widths of panels in fullscreen mediamanager to be 100% when resizing (FS#2351) -- please test in different screen sizes, etc