pTools Process Execution Modification Utility (prun)

Based off the Sun Microsystems prun utility.  Set each process
running (inverse of pstop).

Usage:
	prun { pid } ...

NOTES:
	- Solaris accomplishes this through the use of the /proc/pid/ctl
	file.
	- Our implementation will initially use the kill() system call to
	send a SIGCONT, which cannot be caught or ignored.

	- 11-28-01 -
		SIGCONT can be ignored or handled.  Even if stopped
		with a SIGSTOP the handeler will be executed and the
		program will not begin execution again.

		A new means of implementing prun must be devised.  A
		new signal (duplicating SIGCONT) that can't be caught
		or ignored seems like the most obvious solution
	- 12-21-01 -
		/proc/<pid>/ctl file has been added into fs/proc/base.c and
		is now being used to implement prun and pstop.  The ctl file
		implementation is still undergoing development however.

