Marker class for SecurityChecking.

- Added a class through which all calles to FunctionBlock supplied code
  must be send. This way AppSecurityManager can recognize when code is
being executed within that context.
improve logging
Write the ultimatively evil block!

- Add block to test security settings of Applications, which tries to
  break the module in various ways.
Improve ApplicationSecurityManager

- Add exceptions to rules in AppSecurityManager
- Generally make code more resistant against rough usersupplied
  FuncBlock code
- Improve evilness of EvilBlock }:-)