Trivial sync to bsd.lv:
Kristaps changed the size member of struct manpaths from int to size_t.
No functional change.

remove some unnecessary sys/param.h inclusions

Support leading, trailing and double colons in MANPATH
to prepend, append or insert the man.conf(5) default path;
compatible with GNU manpath(1), implementation by kristaps@,
heavily tweaked by me.

Improvements from kristaps@:
(1) Make the database format simpler and smaller by
- storing the file type as a single character and
- storing paths relative to the dir containing the database.
The lat

Improvements from kristaps@:
(1) Make the database format simpler and smaller by
- storing the file type as a single character and
- storing paths relative to the dir containing the database.
The latter allows to move trees around.
Both together typically save 15-25% of the index size.
(2) Make sure apropos(1) "any" really covers all search keys.
(3) Make manpath_parseline() static, drop manpath_parseconf() completely.

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implement -C (alternative config file) for apropos(1) and mandocdb(8);
ok kristaps@

Resync to bsd.lv, most code from kristaps@.
In particular, support the MANPATH environment variable
and don't confuse index record numbers when working with
multiple mandoc databases at once.
Besides

Resync to bsd.lv, most code from kristaps@.
In particular, support the MANPATH environment variable
and don't confuse index record numbers when working with
multiple mandoc databases at once.
Besides, remove lots of gratuitious code and whitespace differences.

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