Also add a function that centralizes the logic for locating all our perl
files and use it in pgperlcritic and pgperltidy as well as the new
pgperlcheck.
Wrap the perltidy invocation into a shell script to reduce the risk of
copy-and-paste errors. Include removal of *.bak files in the script,
so they don't accidentally get committed. Improve the directions in
the README file.