Fix validaton of same-protocol URIs (^//)
Add Calibri to the default font list
Fix validation bugs on Picocon Reg page
Add in -moz-boz-sizing definitions
Add link to pre-registration at top of picocon page
Fix up post reg page to have headings

This also removes the links to the t-shirt pre-sales, and corrects
the links to the ticket pre-sales pages
Line spacing in the CTA on Picocon page