This request makes "Your last update" of the extension info shown when
clicking more info triangle mark. The first installed date of the
extension may not be necessary for local site admin work.

This now pulls all data from official jQuery sources. Either their CDN
or their github account. Google tends to serve outdated or even broken
files :-(

Unfortunately there's no simple way to get the latest stable jQuery-UI
so for now the version has to be adjusted manually in the script.

':' is the field delimiter in the authplain flat text
conf/users.auth.php file, but it's also used as an internal delimiter
for the 'mediawiki' password hash format. Currently using this hash
format corrupts the file

This change escapes ':' as '\:' in any field in the users.auth.php
file, and any '\' as '\\'.

Also adds test cases for escaping modes.

This should be superseded by a proper rewrite of the media manager code

The edittable plugin broke uploading in IE8 (and maybe others) because
the Handsontable script adds a function to the Array prototype and the
uploading script did not properly check that.