v4.6.2

Changed

• watch needs a server of version 4.5.0 or newer (/info with connections and scenario). Before, it left out the lines that an older server did not report; now it stops with This server is torchio 4.2.1, and watch needs 4.5.0 or newer. A server newer than watch is read as before.
• When a command or an option is wrong, the usage is printed on the standard error, after the message, and not on the standard output, so it no longer ends up in a file or a pipe that receives the output of a command. --help, -h and help still print it on the standard output.