- changed the way POD is generated such that the dashed

  line appears at the bottom instead of the top.  The
  indentation semantics of POD make the first item in
  the (=over,=back) block look weird the other way.
- implemented a way to encode example usage into usage.h
  One would define a macro called "${applet}_example_usage"
  which would expand to the example text.
- The example usage is considered optional, but trivial and
  full usage are not.

  Here's an example using chown.

---- before

#define chown_trivial_usage \
	"[OPTION]...  OWNER[<.|:>[GROUP] FILE..."
#define chown_full_usage \
	"Change the owner and/or group of each FILE to OWNER and/or GROUP.\n" \
	"\nOptions:\n" \
	"\t-R\tChanges files and directories recursively."
#define chown_example_usage \
	"\t$ ls -l /tmp/foo\n" \
	"\t-r--r--r--    1 andersen andersen        0 Apr 12 18:25 /tmp/foo\n" \
	"\t$ chown root /tmp/foo\n" \
	"\t$ ls -l /tmp/foo\n" \
	"\t-r--r--r--    1 root     andersen        0 Apr 12 18:25 /tmp/foo\n" \
	"\t$ chown root.root /tmp/foo\n" \
	"\tls -l /tmp/foo\n" \
	"\t-r--r--r--    1 root     root            0 Apr 12 18:25 /tmp/foo\n"

---- after

=item I<chown>

chown [OPTION]...  OWNER[<.|:>[GROUP] FILE...

Change the owner and/or group of each FILE to OWNER and/or GROUP.

Options:

	-R	Changes files and directories recursively.

Example:

	$ ls -l /tmp/foo
	-r--r--r--    1 andersen andersen        0 Apr 12 18:25 /tmp/foo
	$ chown root /tmp/foo
	$ ls -l /tmp/foo
	-r--r--r--    1 root     andersen        0 Apr 12 18:25 /tmp/foo
	$ chown root.root /tmp/foo
	ls -l /tmp/foo
	-r--r--r--    1 root     root            0 Apr 12 18:25 /tmp/foo


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