gdb/

	gdb/
	* inferior.c (print_inferior): Align columns left.  Remove header
	for the the "current" column.  Rename column "Id" to "Num".
	Rename column "PID" to "Description".  Print if there's no selected
	inferior.

	gdb/doc/
	* gdb.texinfo (Debugging Multiple Inferiors): Add "info inferiors"
	small example, and describe its columns.  Replace "inferior-id" by
	"infno" throughout.