Fix pagetools display without images FS#2634

This makes the pagetools in non-hover/static/active-mode use another
image replacement technique that falls back to the text when images are
disabled. Furthermore this fixes the :focused-display in IE7 by using
:active, too.
Use "old" image replacement for pagetools in IE7

This fixes the image display in IE7 with the disadvantage that now in
IE7 with images disabled the text won't be displayed anymore.
alternative fix for FS#2734
fixed loading of old configuration for auth plugins
handle public vs. private ressource in sendFile()
fixed passed cache parameter
adjusted cache=0 headers again
max-age not allowed with no-cache
there's no pragma: private
Merge pull request #193 from splitbrain/altcachesecurity

alternative fix for FS#2734
Merge pull request #191 from splitbrain/FS2634

Fix page tools display with images disabled FS#2634
Release preparations
Language files: insignificant fixes
Bulgarian language update
Redirect only in the show action to namespace start pages FS#2743

When the current page id ends with ":" (or "/" with useslash enabled)
DokuWiki tries to find the start page of namespaces automatically and
then redirects to this page. The target of the redirect is always the
show action regardless if the current request contains another action or
is an ajax request. In practice you can get this problem when your
search query ends with ":" (e.g. because you want to match a namespace),
then you are redirected to the show action.

This change completely disables the redirect when $ACT is undefined or
the current action is not "show".
fixed use of removed plugin function in revert plugin (FS#2744)
increased copyright year in wiki:dokuwiki
Traditional chinese language update
French language update
typo fix