Complex -column patches finished.

Complex -column patches finished.

[Kristaps Dzonsons]

Hello,

We now accept arbitrarily complex `Bl -column' list items, e.g.,

.Bl -column asdf asdf
.It Fl a
.Fl b Ta
.Ao c Ao
.El

old groff gets confused when handling these: it spews out weird 
white-space.  The above, for example, produces

DESCRIPTION
      -a -b      <c>

while new groff and mandoc correctly render

DESCRIPTION
      -a -b   <c>

Both old and new groff get a little confused when handling trailing tab 
markers instead of `Ta', e.g.,

.It Fl a <TAB>
.Ao c Ao

while produce a leading whitespace to the "<c>".

We actually support this:

.Bl -column asdf asdf
.It Fl a
.Fl b Ta
.Bl -enum
.It
foo
.El
.Ao c Ac
.El
asdf

And it doesn't look [too] bad.  I think we should be raising warnings if 
block-level elements are introduced in a -column context, but, on the 
otherhand, -Thtml will actually produce sane output with arbitrarily 
complex constructions.

There may be a bit of fallout from this, although I haven't really 
noticed any, so keep an eye on your complex lists.

NOTE: we still don't do "implied" `It'.  I'll try to take care of this 
next, as then I can remove some checks.

Thanks,

Kristaps
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