issue 229: adds help when you have no cmdline parameters for hekad or flood
switched to using NFlag instead of length of Args()
Cleanup stat_accum_input Flush() implementation

+ prepare code for setting custom namespaces
remove functionality which is not present in etsy/statsd

  When timer request with no timer values was processed Heka generated
false(?) timer messages as if timer 0 was sent. etsy/statsd seems to ignore
such requests.