o remove -f from doscmd man page, as it is not implemented.

o remove -f from doscmd man page, as it is not implemented.
o Remove init printf
o Don't set optind from return value for do_args.  getopt has already
  done this.
o Bump EMS memory from 1M to 10M (this really should be a command line
  option).
o Open /dev/null when requested to open emmxxxx0 to allow many programs
  checking to see if EMS is installed to find it.
o Route int67 to ems_entry to allow EMS to be used when DOS is emulated
  as well as when DOS is booted.  This may obviate the need for the
  driver doing anything at all in a really booted situation and won't
  hurt that case.

I can now run the DOS program I'm interested in running with enough
EMS memory that its "advanced" functions are enabled and working.