Introduce a man(1) -l option as an alias for mandoc -a.

Basically, this does the same as man -l in Linux man-db.
The point is that now all functionality of the combined tool
is reachable from the man(1) command name:
apropos = man -k, whatis = man -f, mandoc = man -cl.

Originally suggested by Carsten dot Kunze at arcor dot de,
current maintainer of the Heirloom Documentation Tools.

While here, add various missing information to the usage()
and to the manuals.

1 files changed, 19 insertions, 3 deletions

diff --git a/apropos.1 b/apropos.1
index 52489096..cc169da2 100644
--- a/apropos.1
+++ b/apropos.1
@@ -24,7 +24,7 @@
 .Nd search manual page databases
 .Sh SYNOPSIS
 .Nm
-.Op Fl acfkw
+.Op Fl acfklVw
 .Op Fl C Ar file
 .Op Fl M Ar path
 .Op Fl m Ar path
@@ -104,16 +104,30 @@ In this mode, macro keys, comparison operators, and logical operators
 are not available.
 This overrides any earlier
 .Fl k
-option.
+and
+.Fl l
+options.
 .It Fl k
 Support the full
 .Ar expression
 syntax.
 This overrides any earlier
 .Fl f
-option.
+and
+.Fl l
+options.
 It is the default for
 .Nm .
+.It Fl l
+An alias for
+.Xr mandoc 1
+.Fl a .
+This overrides any earlier
+.Fl f ,
+.Fl k ,
+and
+.Fl w
+options.
 .It Fl M Ar path
 Use the colon-separated path instead of the default list of paths
 searched for
@@ -143,6 +157,8 @@ By default, pages from all sections are shown.
 See
 .Xr man 1
 for a listing of sections.
+.It Fl V
+Print version and exit.
 .It Fl w
 Instead of showing title lines, show the pathnames of the matching
 manual pages, just like