- support additional registration data using clientSetup4SMT.sh
  + this option is needed for cloud environments where instance verification
    requires data that can be collected only in the guest instance. This
    data has to be transmitted to the SMT server to verify access rights
    to the SMT repositories
use Catalog.id directly
getFile() should return the content directly if wanted
Make staging work with checksum prefixed metadata files
explicitly unlink the standard name

prevent to modify a hardlink and update production when modifying testing
Merge pull request #6 from rjschwei/addDataConfig

support additional data in config file ... ok