Merge tag 'v2.5.5' into develop

refine wiki module, add documentation and optimize return types

Jenkinsfile

-node {
-
-  stage('Preparation') {
-    checkout scm
-    sh 'rm -f build/*.xar'
-  }
-
-  stage('Build') {
-    sh 'ant'
-  }
-
-  stage('Publish') {
-    archiveArtifacts artifacts: 'build/*.xar', onlyIfSuccessful: true
-    FILENAME = sh (
-        script: "find build/ -name '*.xar' -exec basename {} \\;",
-        returnStdout: true
-      ).trim()
-    sh "curl -X POST -F 'file=@build/${FILENAME}' http://localhost:8181/exist/apps/receiver.xql"
-  }
-  stage('Post') {
-      always {
-          cleanWs()
-      }
-  }
-}

build.properties

 project.namespace=http://textgrid.de/ns/SADE
-project.version=2.5.4
+project.version=2.5.5
 project.title=Scalable Architecture for Digital Editions
 project.abbrev=SADE