Add support for DL Stage

[eddybl]

Source is the internal patch file

I removed the std::cout commands and also therefore #include <iostream>

This is IBPT internal review, after that I would create a PR to upstream

[smarsching]

In general, this looks good to me, I just found a few inconsistencies regarding formatting of the code and one change that looks redundant to me.

[smarsching]

There is one line remaining where the indendation is still wrong. Apart from this, everything looks good to me now.

Your point about the typo in the debug code is valid. I agree that it is probably better to fix this in a separate commit, because it is unrelated to adding support for the DL stage.

I think that the whole handling of debugging isn’t very nice at the moment. It would be better to use asynPrint wherever possible and use conditional debug statements everywhere else (or, if someone is really worried about performance, wrap the debug code in #ifdefs). Just about every other solution is clearner than leaving commented out code in the sources. However, this is a completely separate issue, so I do not think that this has to or should be addressed in the context of this PR.