/TODO

 1- Addy requests more prun-like options
 2- Optional pdsh.conf file for configurable system wide defaults
 3- Improve xpoll() interface??
 4- autoconf putenv
 5- support long options
 6- command line check for fanout > posix thread limit
 7- option to allocate all threads/mem before executing command
 8  - important so that if fanout is too large, commands won't
 9    be started and killed halfway through.
10- bproc rcmd module
11- ssh module should use pipecmd