Add support for -v option on OpenBSD

The `-v` (verbose) flag for `cp`, `ln`, and `rm` is not standard. It is
simple to implement using shell functions, so introduce `cp_v`, `ln_v`,
and `rm_v`. These shell functions use the existing `$VERBOSE` variable
for printing, which simplifies the code and reduces the number of
variables.

Fixes #61.
Fix the NEWS.md.in

Add 1.2.1 to the NEWS.md.in and move the unreleased news items to the
correct spot.
Fixed hooks not executing under Cygwin
Generate the list of contributors from git

Instead of requiring contributors to update rcm(7), pull the list of
contributors from the git log instead.

The `rcm.7` file has been moved to `rcm.7.mustache`. The `autogen.sh`
command will write `rcm.7` using autocontrib, a quick script included in
this commit.

This commit adds a `.mailmap` file, used by git-shortlog(1) to produce
correct and useful names and email addresses. An initial `.mailmap` has
been added to correct some existing email addresses and duplications.
`.mailmap` is documented in [Documentation/mailmap.txt][mailmap] for
git.

This adds a maintainer dependency on Ruby and the mustache gem. The
autocontrib program is spiked out in Ruby due to my familarity with the
language, but the choice of templating language (mustache) allows
flexibility for switching languages later. This is a dependency
requirement only for people who run `autogen.sh` -- maintainers.

This adds a maintainer dependency on git. Again, this is only for
maintainers, and many (all?) of them need git to get rcm's source
anyway.

Thanks to Patrick Brisbin and George Brocklehurst for the review.

[mailmap]: https://github.com/git/git/blob/6a907786af835ac15962be53f1492f23e044f479/Documentation/mailmap.txt
WIP: C version of lsrc
WIP c version of lsrc
WIP c version of lsrc
WIP: C version of lsrc
read_rcrc returns the environment variables in rcrc
Ooops, remove old code
use braces in cleanup block
wip
complete initial implementation of lsrc in C
use a non-interactive shell to read rcrc
use the -a flag to sh to export all set vars