Parent pom is used to centralized the specification of plugin versions to use (in order to get reproducible build) and also dependencies version (to use same version across all modules of the project).

Add JUnit 5 to use latest version of JUnit as project have currently no tests.

Fix Gitlab bug open time: only open bugs were counted. And set update time to min(update, close) for all bug trackers

First basic CI configuration

See merge request ow2/ow2-mrl!2

Need to be implemented with automated deployment using maybe SSH or Ansible.

Only compile and run test.

Minor pom.xml improvements

See merge request ow2/ow2-mrl!1

- Specify source encoding
- Configure Java version for source and target bytecode
- Specify (for `maven-compiler-plugin` and `maven-dependency-plugin`) and update (for `maven-jar-plugin`) plugin versions to ensure reproducible builds