charset: page with latin1 character table

A 16x16 table with each iso-8859-1 byte in order.  Rather than simply
using chr(code point), it converts the byte range using Encode::decode,
so it can just as easily display any other charset known by Perl.

Uses the digraphs include for character details.  While this may lack
some characters, it is faster and easier.  Plug the most glaring gaps by
adding the entire ASCII range as single-character "digraphs".

Linked from vi i^v (as code points can be entered there), but mostly
useful as reference (not necessarily limited to vim).