Add new sensors for chip frequency and power (when permissions allow) Note that we don't support all chipsets at this time, but others are welcome to extend as desired.

cmr=v1.7.5:reviewer=rhc
Some minor cleanups:

* don't return null if someone wants to print ORTE_SUCCESS

* rename some stale process types

* keep show_help local if we are in standalone operation as there is nobody to send it to

cmr=v1.7.5:reviewer=jsquyres