This also handles the latent problem, that nobody checks, whether the user of a tuple is actually a Proj and not the End node.

Projs are not scheduled anymore.

All users check, that the blocks are equal, beforehand.

- some code cleanup
- avoids the case where 2 dumpers are registered

The only user knwos, where its sp is.

bearch: Dump the output requirement and the assigned register in the same line for better readability.