- Found while testing XAMcontentStore
- Pulled stream copy code into AbstractContentWriter
- OutputStream closure (write-side) exception is rethrown to allow full rollback, etc
git-svn-id: https://svn.alfresco.com/repos/alfresco-enterprise/alfresco/HEAD/root@31441 c4b6b30b-aa2e-2d43-bbcb-ca4b014f7261