New activity Datapol::DeleteEntry
Add context parameters to PersistCertificateMetadata Activity

Allow definition of parameter mapping from context into the activity and
use it to build metadata information.
Update SCEP Enrollment (Notify / Metadata / Policy Pending / Remove UniqId)
log refactroing

Introdcue new Log facility application
Refactor existing and add additional log statements
New client class OpenXPKI::Client::Simple

Client providing a simple interface for "one shot" tasks
Relax regex for username (allow digit and dot)
Add flag to have root cert in pkcs7 chain bundle
Allow CSR with empty subject

Microsoft enrollments have csr with empty subject =(