branches: 1.1.1.6.4; 1.1.1.6.10;
Import mdocml-1.11.1 with a few additional fixes from CVS:

Merge the libraries into a single frontend, libmandoc.
Iinitial support for eqn(1) functionality.

Additional changes:
Portability fixes (tbl_opts.c 1.11, tbl_layout.c 1.18, tbl.c 1.25)
HTML space fixe (mdocml_html.c 1.163)
ROFF conditional nesting bug (roff.c 1.131)