v1.51.0-patched-5

sync: add alrternative CopyDir implementation

Add sync.CopyDir2 which is coping files from directory
to directory based on absolute paths from the root of
file systems.

v1.50.2-patched-18

Adds:

• rclone#3955
• rclone#3954
• rclone#3960

v1.50.2-patched-9

Adds selected s3 upstream changes

v1.50.2-patched-10

Adds a fix for rclone#3861

v1.50.2-patched-7

Adds rclone#3848