sync to 1.9.0: polishing the core code of mdoc macro handling

1) If a macro is not parsed, do not parse it.  Of course, without
parsing it, we cannot produce "macro-like parameter" warnings,
but these were useless anyway.
2) If a macro is not callable, do not print a useless warning when
it occurs as a parameter, just display the raw characters.
3) Below .Bl -column, check whether macros are callable.
4) Like groff, allow whitespace after the initial dot on macro lines.

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