Complex -column patches beginning.

Complex -column patches beginning.

[Kristaps Dzonsons]

Hello,

The next few patches are going to iteratively build mandoc up to 
handling very complex -column lists (probably far more complex than what 
groff can handle, but who knows).  I've put together a working solution 
but it's hard to follow the logic all at once (it spans many files in 
small places), so I'm going to break it apart and check it in piecemeal. 
  It'll go something like this (in logical order, not per check-ins):

  (1) prep mdoc_macro.c blk_full();
  (2) switch `Bl -column' `It' multi-parts to use MDOC_BODY instead of 
MDOC_HEAD for the multi-part component;
  (3) add `Ta' for proper handling of tabbed-parts;
  (4) strip `Ta' from mdoc_argv.c and have it break correctly.

Please pass an eye over these as they go in, as the parts they're 
modifying are critical.

Thanks,

Kristaps
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