
Fomat POD documentation as XHTML. Syntax-highlight code blocks.

Standard methods implemented
Can format *.pod.
Handles 'pod' which is perl's Plain Old Documenation. See perlpod.
Overrides Pod::Xhtml to provide syntax-highlighting of code blocks.
To specify a language for a code block,
and all remaining code blocks,
make the first line lang:LanguageName,
like lang:Perl or lang:Haskell.
To turn off syntax highlighting until the next lang: directive,
do lang:0 or lang:undef.
pod-- (long story)