Cleanup conversion specs
Cleanup conversion specs

Cleanup conversion specs by splitting off the invalid coding samples into
separate namespaces (UTF8::Invalid and UCS2::Invalid) and referring to them
by constants.

Signed-off-by: Wincent Colaiuta <c76ac2e9cd86441713c7dfae92c451f3e6d17fdc@wincent.com>

geni/wikitext,geni/wikitext,wincent/wikitext,geni/wikitext,barnaclebarnes/wikitext,wincent/wikitext,barnaclebarnes/wikitext,barnaclebarnes/wikitext