Error trying to open mmapFileIo after close

Error trying to open mmapFileIo after close

Reset announce list on modify, don't clear it

clear does completely different things for maps and slices, beware.

Fix out of order openNewConns causing a benchmark to fail

Fix out of order openNewConns causing a benchmark to fail

Add missing min record for trackerAnnounceHead when Torrents are dropped

(cherry picked from commit a8e9739)

Fix pedantic infohash concurrency check

Don't fetch piece priority for ended webseed requests

Don't fetch piece priority for ended webseed requests

Don't fetch piece priority for ended webseed requests