[maven-release-plugin] prepare release doxia-1.6

git-svn-id: https://svn.apache.org/repos/asf/maven/doxia/doxia/trunk@1606237 13f79535-47bb-0310-9956-ffa450edef68
[maven-release-plugin] prepare for next development iteration

git-svn-id: https://svn.apache.org/repos/asf/maven/doxia/doxia/trunk@1606239 13f79535-47bb-0310-9956-ffa450edef68