The license file, which is not version-controlled, got lost during branch
switching and was not included in the 2.4.0 ZIP file.
Improved the release script so that it aborts if tar has errors.
The regular expression used to split the page content had a few pipe
characters in the wrong places, due to the previous 'cleaning-up' of the
convoluted expression for version 2.3.0.
Page titles are now properly escaped using preg_quote() to prevent regexp
compilation errors if the title contains characters with special meanings in
regular expressions.
If a page title does has a different case than an occurrence of the same
word(s) on the page that is being edited, the extension will now
automatically generate 'piped' links such as [[Linking titles|Linking
Titles]].
