* lib/model: Don't panic on failed chmod-back on directory (fixes#5836)
This makes the "in writable dir"-wrapper log chmod-back errors instead
of panicking. To do that we need a logger so the function moved into the
model package which is also the only place it's used. The tests came
along.
(The test also exercised osutil.RenameOrCopy like some sort of
piggybacking. I removed that.)
Fsyncing the file has a small performance penalty and seems unnecessary. The
file will be fsynced anyway, when the changes are commited to the database.
GitHub-Pull-Request: https://github.com/syncthing/syncthing/pull/3749
These are no longer required with Go 1.7. Change made by removing the
functions, doing a global s/osutil.Remove/os.Remove/.
GitHub-Pull-Request: https://github.com/syncthing/syncthing/pull/3514
