2.0 - Made 'safe' version using the Perl Safe module.

1.4 - Added 'reprocess' and 'preprocess' attributes to PerlScript tag.

1.3 - Added interface code for the Macros plugin.

1.2 - MT tags produced by PerlScript will now be processed as advertised.

1.1 - Update to allow packages to only be evaluated once. This is useful
when you have PerlScript blocks that are processed in category, date or
individual archive pages.

1.0 - Initial release