added option to enable automatic popularity data in installer

de/de-informal: language updates / added "sidebar"

Before this change the GIF wasn't sent at all when the PHP settings
indicate that sending of the GIF needs to be deferred and it was sent
when the debug output was on.

This changes the previously static lastsecid into an instance variable,
this leads to consistent section edit ids when the xhtml renderer is
used more than once in a request. This makes it possible for test cases
to know the exact section edit id for an instruction array.

support CONNECT for tunneling SSL via HTTP proxies FS#2431

Translatable string for "None" license selection

  - removed some dead/unused code
  - fixed phpdoc
  - added typing on methods

the function always returned true, even if no action was taken. This
resulted in no further indexer tasks being run.

Fix case-insensitive match in ACL checking

ACL checking of DokuWiki is currently always case-sensitive
regardless of auth backend setting ($auth->isCaseSensitive).
This commit enables case-insensitive match in the same way
of auth_isMember().

Ignore empty email headers

Empty BCC/CC headers may cause errors on IIS.

* 'guide' of git://github.com/splitbrain/dokuwiki:
  changed semicolon to colon in link to welcome page to make it less confusing
  added initial pages to not be ignored by git
  improved welcome text
  added welcome page
  changed the link in the installer to point to wiki:welcome

Conflicts:
	inc/lang/fr/lang.php

* 'master' of git://github.com/borekb/dokuwiki:
  Colon is no longer rewritten to semicolon for IIS 7.x and for older versions of IIS, semicolon is displayed as is, not URL-encoded.

Conflicts:
	inc/common.php

Typo fix for TL;DR

New Tar Archive library

We now have two defines for checking for UTF-8 and Unicode property
support in PREG and use them to work around FS#2636 on older systems.