Add more output in case of unknown cipher-ids to aid in debugging bugs like 57195

git-svn-id: https://svn.apache.org/repos/asf/poi/trunk@1641883 13f79535-47bb-0310-9956-ffa450edef68
Include root-cause exception information when constructing ContentTypeManager fails

git-svn-id: https://svn.apache.org/repos/asf/poi/trunk@1641940 13f79535-47bb-0310-9956-ffa450edef68
Typo and remove unnecessary casts

git-svn-id: https://svn.apache.org/repos/asf/poi/trunk@1641941 13f79535-47bb-0310-9956-ffa450edef68