[maven-release-plugin] copy for tag dnet-pace-core-1.1.0
[maven-release-plugin] prepare release dnet-pace-core-1.1.0
updated dependencies to use release version
removed protocolbuffers dependency from dnet-pace-core, Builders and Proto specific tests moved in dnet-openaireplus-mapping-utils, adapted dnet-mapreduce-jobs
merged from branch 1.1.0