Try to improve Maven files for Sonar: Copy in (test)sources instead of linking to...

Try to improve Maven files for Sonar: Copy in (test)sources instead of linking to sources outside the sonar-directory which confuses Sonar, remove source-dir setting for ooxml-schema and ooxml-schema-encryption as both have generate sources and not actual ones, scratchpad is not needed for ooxml

git-svn-id: https://svn.apache.org/repos/asf/poi/trunk@1572580 13f79535-47bb-0310-9956-ffa450edef68