This project definition contains the core definition for all Maven 2
projects of Day Management AG such that we have a consistent project
build environment and need not repeat common configuration everytime.
Each parent project of the Day products should refer to this project
(${project.groupId}:${project.artifactId}:${project.version}) as its
parent. It is not intended for this project to be modified often.
Hence use a simple counter as its version.