Add dynamically generated help text.
Add dynamically generated help text.

*src/pmdas/papi/papi.c - use papi_text to return the help string
		       	 directly from papi.  This will also be advantageous
			 when the pmns is possibly dymanically generated

adfernandes/pcp,aeg-aeg/pcpfans,prasincs/pcp,adfernandes/pcp,andyvand/cygpcpfans,wuliming/pcp,edwardt/pcp,andyvand/cygpcpfans,mbaldessari/pcp,adfernandes/pcp,tjanez/pcp,wuliming/pcp,edwardt/pcp,edwardt/pcp,adfernandes/pcp,tjanez/pcp,aeg-aeg/pcpfans,tjanez/pcp,andyvand/cygpcpfans,tjanez/pcp,adfernandes/pcp,prasincs/pcp,tjanez/pcp,tjanez/pcp,wuliming/pcp,mbaldessari/pcp,prasincs/pcp,andyvand/cygpcpfans,andyvand/cygpcpfans,aeg-aeg/pcpfans,tjanez/pcp,mbaldessari/pcp,edwardt/pcp,edwardt/pcp,aeg-aeg/pcpfans,andyvand/cygpcpfans,edwardt/pcp,prasincs/pcp,andyvand/cygpcpfans,prasincs/pcp,prasincs/pcp,mbaldessari/pcp,adfernandes/pcp,aeg-aeg/pcpfans,prasincs/pcp,edwardt/pcp,adfernandes/pcp,wuliming/pcp,adfernandes/pcp,wuliming/pcp,wuliming/pcp,andyvand/cygpcpfans,prasincs/pcp,aeg-aeg/pcpfans,wuliming/pcp,wuliming/pcp,tjanez/pcp,edwardt/pcp,aeg-aeg/pcpfans,aeg-aeg/pcpfans,mbaldessari/pcp,mbaldessari/pcp