See http://learn.perl.org/faq/perlfaq1.html#Whats-the-difference-between-perl-and-Perl-

We need to decide how to handle the renaming of the auth classes. Should
this be done automatically somehow? Or is an admin expected to fix this
manually when updating?

the new template allows to use a favicon in media/wiki/favicon.ico so we
should support uploading it as well.

We had a lot of options lumped together under "Advanced Settings". I
introduced two more categories and move a few options to other existing
categories.
I also reordered the appropriate entries in the source files to make it
easier to find stuff when extending the options.

We had a lot of options lumped together under "Advanced Settings". I
introduced two more categories and move a few options to other existing
categories.
I also reordered the appropriate entries in the source files to make it
easier to find stuff when extending the options.

already installed wikis

%GROUP% is the same as %USER% except it's done on each group a user is
in.
%USER% and %GROUP% cannot be mixed on an ACL line.

Templates authors should support these to make the transition between templates easier. Templates which already have a sidebar could first check for $conf['sidebar'] and use it if it's defined, otherwise use their old own sidebar functionality to stay backwards-compatible.

Translators need to add another string.

renamed plugins.protected.php to plugins.required.php and added it cascade to allow overwriting as a local protected file

Function get_plugin_components() moved to extantion manager

The feature is now disabled by default.
Metadata for config manager was added.

This patch adds a new config option 'cssdatauri'. When enabled, the CSS
patcher will automatically convert all occurances of small (<600 byte)
PNG and GIF images in the CSS to embedded, base64 encoded data uris.

This reduces the number of needed HTTP requests and avoids the HTTP header
overhead.

Before this patch with a .htaccess file on a higher level in the
hierarchy with "Satisfy Any" it has been possible that the directory
protection didn't work as expected.