Besides that being a useless construct to begin with, not all shells
even support parameters to echo. Nuke that abomination from or^Wthe
repository.

slave-agent has explanatory comments at the start
slave-client has a --help argument.

The sample agent implements some testing, verification and
benchmarking functionality.

run-nxproxy2nxagent-over-network: Improve comment that describes script usage. Fix commented-out NX_HOST assignment.

run-nxproxy2nxagent-over-network: New test script that tests nxproxy/nxagent connectivity between networked hosts.