This drops support for Internet Explorer <9 which we no longer support.

The opera work around is still needed though! O_o

Standardized node.textContent is available since IE9

Remove old browser support

Our minimum PHP version requirement is now over 5.3, so this workaround is
not needed anymore. See also c9454ee3

Translation update (fr)

Add generic 3way merge capability

Show change of file sizes in the revision log

add rel=noopener to links opening in new window

Textareas use CRLF, but internally we use LF.

Add an ACL check in page_findnearest, fix #1369

Translation update (es)

@scrutinizer-notifier noticed that the $pageid might be false when
page_findnearest looks for it.

Make cleaning optional in mediaFN, keep as default

reusing the diff colors as suggested by @selfthinker

As in wikiFN cleaning the id should be optional, but still the default, in mediaFN as well.

when a form was submitted with an empty input, that data should still
overwrite the preset value.

This is a security measurement supported in Chrome and Opera (and
probably other browsers soonish)

See http://mathiasbynens.github.io/rel-noopener/ for rationale

add conf as global in mediamanager.php

This adds 3way merge functionality to our DifferenceEngine stack. The
code was taken from the PEAR Text_Diff3 package and adapted to work with
our implementation.

For the curious:
Here's a short Origin tree of the different versions of the Diff code to
make clear how our implementation is related to the PEAR package.

-- original code Geoffrey T. Dairiki
   `-- Adaption for the Horde project
       |-- Adaption for phpwiki
       |   `-- Adaption for MediaWiki
       |       `-- Adaption for DokuWiki
       `-- Creation of PEAR Text_Diff