PyConf: Deterministic identity of components and data

hash(alg/tool/data_handle) are non-deterministic since Algorithm, Tool and DataHandle use hash to construct their "identity" (which is returned by their __hash__). This makes the iteration order of sets of objects non-deterministic, which can be a problem since, at least currently, the names of Algorithms depends on instantiation order.

This is fixed here by using deterministic hashing.

Goes with Rec!3099 (merged)

See Moore!1737 (comment 5951216)

/cc @gunther