A common debug flag for all stream classes now is provided in the base classes
idatstream and odatstream. The debug member data is removed from all specific
input and output stream classes. This way we guarantee that any class which
can be referred to through ianystream and oanystream provides a debug flag.
This is necessary to allow input and output operators for example to check
whether the stream is in debug mode. This way generic operators or functions
can print a debug messages.

Recompiled test cases and full Seitosh repository to make sure that modified
interface operates properly in existing code.