add support for reading, writing and deleting private (require cache_pins) and
public data objects in PKCS11. updated the pkcs11-tool and fixed a few
bugs in the code. Tested on an aladdin etoken.
git-svn-id: https://www.opensc-project.org/svnp/opensc/trunk@3176 c6295689-39f2-0310-b995-f0e70906c6a9