Close the scanner
Use public interface for the digest. Reasons:
- easier interchangability
- safe for developers (only see the functionality they should)
Improve ConsoleClient and add the digest request
ProcessTreeNode slightly improved (no change in functionality)
Clearification of the getDigest: Only files and not folders
Fix recursive addition: consider parent modifications
Do not use a tree for add/modify a file tree

causes version conflicts --> use simple list instead (refactoring
follows)
Started refactoring for Processes launched in the FileRecursionUtil