SOFTHSM-84: Loop all attributes and check that all mandatory attributes are specified in the template
SOFTHSM-84: Use the correct object operation for unwrapping.
SOFTHSM-84: These attributes can be used during the unwrapping operation
SOFTHSM-84: Missing mandatory attribute for GOST key
SOFTHSM-84: Update the NEWS
Merge pull request #75 from bellgrim/SOFTHSM-84

SoftHSM-84: Check that all mandatory attributes are given during the creation process
SOFTHSM-92: Enable -fvisibility=hidden on per default