Since lua-hostlist is used for tasks in some cases, temporarily
bump MAX_RANGE (max upper bound for a host range) to 1M hosts
so that errors are not reported for task counts > 16K tasks.

Eventually this hostlist use case should be replaced with
something like nodeset.

Add number of tasks column to `flux wreck timing` output.

Create kvswatcher (install kvs_watch()) before issueing wrexec.run
request, so no states are lost when running in verbose mode. This
should not affect functionality, but is useful when debugging
flux-wreckrun and/or job launch

Add flags to fatal error log kz object such that a kvs commit
is not issued per line, on open, or on close.

Check for nil input data (e.g. when reading eof only) in the
iowatcher handler for stdin fd. Avoids potential runtime error
in then input.lua plugin.

Check for NULL kz object (though this should not happen)
in lua bindings for kz:write, before calling kz_put().

Add an option to flux-wreckrun to ignore stdio and task exit
status, and instead just wait until the job hits a certain state
(starting, running, or complete), then exit with 0 status.

Document the -w, --wait-until option to flux-wreckrun.