Big cleanup patch - remove a lot of obsolete classes and fix Manifest

This patch removes a lot of Workflow classes which are unused at the
current stage, mainly from the old SCEP and SmartCard code.
Debian Packaging for SCEPv2 Client
Fix dependencies on debian packages

Note: The openca-tools package is available at the OpenXPKI
package mirrors. A debianized source is available at github
https://github.com/openxpki/openca-tools/tree/openxpki