Fix minor typo in the comments/docs.
Use the RTE framework instead of calling ORTE directly.

Brian (rightfully) hit me on the head with the
don't-use-ORTE-use-the-rte-framework clue bat; the usnic BTL now
nicely plays with the RTE framework.
Update one more comment.
MCA/base: fix some warnings and an error in the MCA variable system
sharedfp: ensure sharedfp components register their parameters in mca_register_component_params not mca_component_open