[lmi] Which getopt should we use?

[Greg Chicares]

We anticipate new uses for the command-line version of lmi. I've
been working with a glib++ version of getopt, and have come to
the belated realization that it's been deprecated for years, so
it seems like a good idea to replace it. We want something that
works on a variety of OSs and with different compilers.

Is gnulib
  http://www.gnu.org/software/gnulib/
the right thing to use? I'm thinking we should import
  getopt.c
  getopt1.c
  getopt_.h
  getsubopt.c
from gnulib's cvs. At first, I'd thought of using glibc's code,
but we're going to want 'getsubopt.c', and I don't find that
file in glibc here:
  http://sourceware.org/cgi-bin/cvsweb.cgi/libc/posix/?cvsroot=glibc