This is done by making fs.Config private and attaching it to the
context instead.
The Config should be obtained with fs.GetConfig and fs.AddConfig
should be used to get a new mutable config that can be changed.
The purpose of this is to make it easier to maintain and eventually to
allow the rclone backends to be re-used in other projects without
having to use the rclone configuration system.
The new code layout is documented in CONTRIBUTING.
* -vv or --log-level DEBUG
* -v or --log-level INFO
* --log-level NOTICE (default)
* -q --log-level ERROR
Replace Config.Verbose and Config.Quiet with Config.LogLevel
Fixes#739Fixes#1108Fixes#1000