v.5.0.1 - security update release

Version 5.0.1 is a security update, related to a denial-of-service
vulnerability in the "regex" dependency used by the program.
The "goblin" dependency, used for parsing executables and libraries,
has also been updated.

Add a "publish on crates.io" job to CircleCI config

Release v.4.0 (merge branch 'devel-4.0' into 'master')

Bump the version to 3.0

Remove the old Bash version of cpso

Import cpso.sh (originally written for wilk320)