fixed setting cookie not working

store choices for recent changes and diff views in cookie (FS#2438 and
FS#2700)

Note: These changes don't work yet. The cookie is not set and deletes the old
one.

removed unused vars

moved registration notification to subscription class

consolidate more notification code in subscription class

This is untested and probably broken currently

correctly check if subscriptions are enabled

subscription system should work now again

This readds the last part of the subscription system: the normal "every"
subscriptions.

more subscription refactoring BROKEN

now the actual sending of bulk messages (digest, list) is reimplemented
and partially tested.

Still not complete

highlight queries from popular serch engines only FS#2448

removed obsolete parameter from script() FS#2365

more INPUT wrapper uses: cache purge, sectok, getID

some code cleanup and php docs

empty ID in wl() will be treated as $conf['start']

added option to disable reverse DNS lookups

Merge branch 'master' into htmlmail

* master: (382 commits)
Romanian language update
Marathi language update
Arabic Language Update
when there's not enough space for images, make sure they s

Merge branch 'master' into htmlmail

* master: (382 commits)
Romanian language update
Marathi language update
Arabic Language Update
when there's not enough space for images, make sure they stay proportional (might be FS#2480)
added minimal RTL print styles (part of FS#2185)
moved plugins' rtl.css to their style.css counterpart (part of FS#2185)
removed all browser-specific gradients as the recently (in 42ff6730) introduced svg makes them unnecessary
removed comments from accidentally commented lines in tpl_includeFile()
removed obsolete template file
added tpl_includeFile() to core
Make getTitle method in remote interface public
Changed an error code in XML-RPC interface. This error hasn't anything to do with the rest of the -32600 errors.
BG: language update
Korean language update
fixed performance issues with gradient in Firefox (which also added gradient support for IE9) (FS#2447)
deleted very old (and unused) images
added accidentally removed '<?php' back in (was in 57fc5edd)
wrapped X-UA-Compatible meta tag with conditional comments
added explanation to todo in _forms.css
removed problematic 'overflow: hidden' from lists again ('unfixes' FS#1950)
...

Conflicts:
inc/auth.php
inc/load.php

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coding style updates

add missing table tags for HTML diff mails

Add various headers to the mails FS#2247. pull request #83 closed

use inlinestyles for diffs in HTML mails

fixed missing replacement for HTML notify mails

allow non-txt extensions when accessing locales

Make use of new Mailer class in notify()

It now uses inline diff format for diff HTML mails

bind security token to username

This makes the security token more robust agains session fixation
attacks. A CSRF warning will no longer abort a page save but lead to the
preview mode to avoid infor

bind security token to username

This makes the security token more robust agains session fixation
attacks. A CSRF warning will no longer abort a page save but lead to the
preview mode to avoid information loss when a user logs in during
editing (eg in another tab).

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allow page unlocking based on session IDs FS#2262

Treat a whitespace-only page as empty and delete it FS#2283