This needs testing. We need feedback from someone where this is
reproducible broken before applying this patch.

FS#1874: removed padding for interwiki links in print stylesheet, as the icons aren't displayed there

Tests and feedbacks please!

This patch changes the ft_pageLookup function to always return the
title of pages with the result. This makes it easier to work with the
array, as it no longer changes between numeric and key indexes depending
on useheading.
This also means that action plugins subscribed to
SEARCH_QUERY_PAGELOOKUP need to be adjusted. The event contains a new
data field called 'has_titles' which plugins can use to check for
backwards compatibility.

The title.idx file needs to have exactly the same length as the
page.idx. This patch creates the file with the correct length if it
doesn't exist yet.

If you upgrade in between you need to delete your data/index/title.idx
file

This patch also removes legacy support for @USER@. Only %USER% is valid
now.

msg() now stores always the message to the MSG array until headers are
sent. After this, a call of msg will print out all messages from the MSG
array immediately through html_msgarea.
This prevents double posting and losses of messages from the MSG array.

This patch implements what Adrian's patch "Hide logout button if auth
backend cannot logout" intended to do.

The 'logoff' capability was used to decide if a special method called
$auth->logOff() should be called when the user logs out, not if the
backend supports logouts at all. This was a superflous capability since
an empty logOff() method is implemented in the base class anyway - it
doesn't hurt to always call the method.

The 'logoff' capability is now deprecated. Backends who want to do
actions on logout simply need to overwrite logOff().

A new capability 'logout' was added which defaults to true. Backends
that can't logoff the user (eg. because they use some automatic
login/logoff mechanism) can set this to false.

Probably makes sense to add a 'login' capability as well...

Original author Sebastian Delmont agreed to rerelease the code
under BSD license to avoid license compatibility problems.

Other authors (me and Hakan Sandell) agreed as well.

This was an edit through the github interface which changed more
than intented.

This reverts commit 1720a8e9.

Behavioural changes:
  * buttons
    * no 'do=show' but clean URLs (show and back buttons)
    * the alias 'subscription' for subscribe buttons is now available
  * links
    * draft link has class 'draft', not 'edit'
    * revisions link has class 'revs', not 'revisions'
  * both
    * 'revision' is added as an alias for 'history'

These changes were mainly introduced to reduce the differences between
links and buttons.

Since an unchecked HTML checkbox has no value at all, a hidden field may be
used to specify an off value for the checkbox.

Since the specs aren't 100% clear, dates might be passed in different
formats by various XMLRPC clients. This patch makes date parsing a bit
more flexible.

Unit tests included.

according to the specs a value without a type is
recognised as string. This patch handles empty value
tags the right way as empty String.