Improve manual pages.

* help output needs to be to stdout not stderr for help2man (*.c,*.h)
* Add EXIT_INFO return code.  (*.c,*.h)
* Start filling out man pages, e.g. add SEE ALSO. *.help2man
* Remove non-existent reference to Info pages Makefile.am

src/cd-info.help2man

@@ -0,0 +1,8 @@
+[SYNOPSIS]
+.B cd-info
+\fIOPTION\fR...
+.TP
+Shows Information about a CD or CD-image.
+[SEE ALSO] 
+\&\f(CWcd-drive(1)\fR for CD-ROM characteristics;
+\&\f(CWiso-info(1)\fR for information about an ISO-9660 image.