UTF-8 support: In a UTF-8 locale, properly align columns in the
presence of zero-width and double-width characters and replace
non-printable codepoints and invalid bytes with ASCII question
marks. N

UTF-8 support: In a UTF-8 locale, properly align columns in the
presence of zero-width and double-width characters and replace
non-printable codepoints and invalid bytes with ASCII question
marks. No change in the C/POSIX locale.
As a side effect, get rid of all pointer to pointer variables
and simplify some of the code.

Partially based on ideas from tedu@.
Feedback and OK czarkoff@, OK tedu@.

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