Enhancements for false positive rates

The query command now can, optionally, adjust a query's reported hits for a given experiment, to adjust for the false positive rate of the experiment's Bloom filter.

To implement this, the Bloom filter file format was modified so that when the file is built it contains information relating to the false positive rate. The old file format is still supported, but any features that require the new information are not supported for files in the old format. The program auto-detects such cases and informs the user when the request cannot be satisfied.