Unify version string printing

Unify version string printing

When a program does sophisticated enough command line processing
(i.e. getopt), make sure it responds to -V and --version.

When a program prints a version string, make sure it uses the
common_print_version macro to print out its name, that it is part
of mtd-utils and the mtd-utils version from the build system in a
fashion similar to common program packages like the GNU coreutils.

When a program responds to -V/--version or -h/--help, make sure it
reports success exit status.

Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
Signed-off-by: Richard Weinberger <richard@nod.at>