#243 FLAC files shared before validated

[Mark Goldey]

When sharing a FLAC fileset, the fileset's .md5
checksum is first calculated, and then the flac files
are validated. The fileset should not appear on the
network until both checks are complete. Currently,
the fileset appears on the network after the .md5
checksum is calculated, but prior to validating the
flac files themselves.

[Mark Goldey]

Logged In: YES
user_id=703977

Re-verified this morning. The fileset reads "shared" to at
least 10 seconds before FLAC validation begins. In that
time, it appears in search results on other Furthur clients
and can be downloaded. During download, the host client
shows "FLAC Validation x%" until the validation is complete,
and then displays "Shared" even though the fileset is being
actively uploaded.

A side observation: during validation, the fileset was
shared between mf1 and mf2 at 250 kBps, dropping to 190
kBps. Once validation ended the speed jumped immediately to
1250 kBps and stayed in that neighborhood.