modify locvec to differentiate entities in parallel, split and star
- differentiate the <parallel> <collector> pairs in each parallel/split
  combinator
- differentiate 2 operands in star combinators (the star operand and the
  subnet inside star): use SNetLocvecStarNext and SNetLocvecStarRetNext
  (so that it will not affect FRONT)
support rts-priority & small code refinement
- allow rts to pass priority to scheduler lpel_hrc, priority is the locvec
- refinement: passing priority choice via global conf
use wakeup record when terminating outputmanager instead of (void *) 1
- this helps to avoid segmentation fault in further process of the message
modify rules.mkf in examples to support all backends (front, pthread,
lpel, lpel_hrc)