Screening assistant 0.3

This version is a minor update of Screening-assistant 0.21.

Our goal was primarily to propose a linux version of the current screening-assistant release, which was only available on windows until now.

We took the opportunity to add some minor modifications, such as bug fixes, additional warning messages, and slightly improved diversity selection algorithm.

The new release is presented under the form of a simple directory. No installation is needed. See the README file for more information.