Dumping of PageRank scores for external use

[sibiryakov]

It would be nice to provide to user a flexible scoring concept, to achieve that we need to be able to dump from Aduana top N (can be 10K or 100K) sorted by PageRank requests, calling some BFScheduler function. No need for exclusion mechanism, just dumping.

Here are the fields that needs to be dumped:

• url,
• fingerprint (if stored),
• PageRank score.

It would be nice to have a C function for this in library and python binding for it.