#210 Provide a timeout option on FS copy

[Jigar Kapasi]

When copying large files using the 'FS COPY FILE'
command, there are cases where the copy may not
complete e.g., due to a network problem. The copy
command would just hang then.

The request is to provide a TIMEOUT parameter on the
COPY FILE command, so that the service can take
action such as retry or error when the timeout value is
reached.

This may be desired on the 'FS COPY DIRECTORY' too.