Y2K-compliant version of "rcs2sccs"

[David J. Coffin]

     Sorry this isn't your code, but it used to be included
in the contrib/ directory.

     RCS uses a four-digit year, which SCCS uses two digits.
"rcs2sccs" does the conversion with "sed -e 's/^19//'".  I've
found that 's/^..//' works much better.

     Here is the corrected script:

                                        Dave Coffin  6/6/00

rcs2sccs.sh