Update to version 0.68; Jan 30, 2012

Lots of fixes for older Perl versions, and several other bug fixes
The parse and data methods are renamed to decode and encode respectively
New feature: IDN query support, requires Net::LibIDN
New modules: Mailbox.pm, Text.pm

For the port:

• Add TEST_DEPENDS (probably won't work on its own due to CONFIGURE_ARGS)
• Add an OPTION for IDN support, off by default
• Use the PORTDOCS macro
• Move the OPTIONS= to the more standard location