David Lillis: Patches

Patch against Authen::Captcha 1.023
Allows the Authen::Captcha module work under taint mode.
Patch against HTML::WebMake 2.4
Support loading of media from symlinked directories using a <media> tag.
Patch against Text::EtText 2.3
Fixes a number of bugs, particularly with regard to XHTML validation. Plus slightly modified handling of link definitions.