Stable / consistent algorithm types for PIDHandler

[tmadlener]

The PIDHandler introduced with #268 leaves the determination / setting of the algorithmType / algoID value to the user. This is quite error prone and we should make it easy / trivial to set a consistent & unique value here via the same tools. The easiest solution is probably to use some hash of the algorithm name.

This issue is mainly here for keeping track of this, as it was raised during the review of #268, but not yet implemented there.