Be less verbose about things we control
Disable trackers by default
Don't exit when non-fatal errors happen

These mostly happen because we can't catch up with what happens
on the disk, but things get eventually consistent so we get things
right the next time the torrentify kicks in
Fallback to empty torrent when new torrent can't be started

So that later calls to currentSession.Quit() doesn't block
Fix wrong metadata when data size is a multiple of 1M

Before this an extra block was created
Wait for a stop in changes to update current meta

In case the changes take more than 10 seconds, some changes will
occur while the meta is recalculated, so the meta will be invalid
which will only be known when trying to launch the current session.

We now wait for one run when there are no changes to start creating
the meta.