To make use of the new 'errors' argument.

'' was used in the original Perl tables both to mean an unknown replacement and
an intentional replacement with and empty string. Here I only replace it in
ranges I've added later where I'm reasonably sure that '' means unknown
replacement.

This adds:

- SQUARED LATIN CAPITAL LETTERs,
- NEGATIVE CIRCLED LATIN CAPITAL LETTERs,
- NEGATIVE SQUARED LATIN CAPITAL LETTERs,
- TORTOISE SHELL BRACKETED LATIN CAPITAL LETTERs and
- CIRCLED ITALIC LATIN CAPITAL LETTERs

Includes "DIGIT ... COMMA" and "PARANTHESIZED LATIN CAPITAL LETTER" characters.