Revert "[maven-release-plugin] prepare for next development iteration"

This reverts commit b1d6ff84ae54584829d51e7f1a6d3d422446caf0.
Revert "[maven-release-plugin] prepare release SlipStream-2.0.16"

This reverts commit c8a2346481d5ec4ee6c2c89bd1854f8ce5c92a9f.