Added test for SYNC: New file on server, server_timestamp > client_timestamp
but file_timestamp < client_timestamp, local directory MODIFIED
Added test for SYNC: server_timestamp == client_timestamp,
local_directory MODIFIED
Added test for SYNC copy on client
Test SYNC: same file in client and server is moved on server
and local dir modified
Test SYNC: same file in server and client is copied on server and local dir is modified