Info is relevant information for the client who whishes to
install URL, which has the given SHA1 hash. Currently provided
info is:
alt_hash(Downloads, URLs, Hash)
Another file with the same (base) name was registered that
has a different hash. This file was downloaded Downloads
times, resides on the given URLs (a list) and has the given
Hash.
downloads(Downloads)
This hash was downloaded Downloads times from a unique IP
address
dependency(Token, Pack, Version, URLs, SubSeps)
The requirement Token can be provided by Pack@Version, which
may be downloaded from the given URLs (a list). Pack has
install info as specified by SubSeps (recursive
dependencies)
Update the database with the given information. We only update
if the request is new, which means the same SHA1 has not been
downloaded from the same Peer.