* Define Mover interface to move a single object
* Define DirMover interface to move a directory
* Implement DirMove operation
* Add `rclone move` command
* Tests for Dir Move
To Do
* Implement Move, DirMover in local, drive, dropbox
* unit test for Mover
* unit test for DirMover
This means that dropbox no longer stores MD5SUMs and modified times.
Fixup the tests so that blank MD5SUMs are ignored, and that if
Precision is set to a fs.ModTimeNotSupported, ModTimes can be ignored too.
This opens the door for other FSs which don't support metadata easily.
...unless had some errors or stats interval requested.
Add fs.ErrorLog to differentiate between Logs which should be
suppressed and errors which shouldn't.
Changed "ls" command not to show modification time by default only
size and path. That is because it is slow for nearly all the remotes
as it requires extra metadata lookup. All remotes can look up files
and sizes without extra operations.
Added "lsl" which does what "ls" used to - namely show modification
time, size and path.
Added "md5sum" which produces the same output as the md5sum command -
md5sums and paths that is.
