- Score can be between 0 and 5 (double) included when being processed.
- We want a result between 1 and 9 so we multiply by 2, truncate the result to an int and bump it to 1 if value is 0 or lower it to 9 fi value is 10.
- Update .gitignore to exclude Maven release plugin files and Dolphin file browser hidden files.

MRL have 9 levels. We got a typo leading to 10 levels. This was a split of `Usefulness Demonstrated` into 2 levels: `Usefulness` and `Demonstrated`.

- Artifact name and module name is `webapp`.
- Artifact `finalName` is `mrl-webapp`.

- Rename variable with data-collection pom file path.
- Remove `target` folder from cache (see recommendation regarding cache usage here: https://docs.gitlab.com/ee/ci/caching/).
- Rename `jar` job to `package`.
- Add jobs for the webapp.

- Remove commented dependency.
- Extract plugins and libraries version in Maven property.
- Remove `source` and `target` in `maven-compiler-plugin` replaced by `maven.compiler.release` when running JDK 9 or higher.
- Add `versions-maven-plugin` configuration to specify a file (`rules.xml`) to ignore alpha, beta, RC and CR versions from available dependencies and plugins updates analysis.
- Run `versions-maven-plugin` `display-property-updates` goal on `validate` phase.

- Add to DatasetFactory a method to get MKT metrics from the database (workaround due to lack of MKT metrics in `Metric` table.
- Add a new constructor to `Metric` class to support lack of threshold for MKT metrics.
- Add controller, service interface and service implementation to provide dendrogram.

- Add to DatasetFactory a method to get MKT metrics from the database (workaround due to lack of MKT metrics in `Metric` table.
- Add a new constructor to `Metric` class to support lack of threshold for MKT metrics.
- Add controller, service interface and service implementation to provide dendrogram.

Fix for weird problems with closed issues: projects that never close issues, and bug in old gitlab versions with null closing date

Should allow to have only code related to display in XWiki page and all preprocessing done in the web app.

- Use slf4j and logback for logging
- Copy dependencies on `package` Maven phase instead of `install`