Strings - temporary and disabled hack
Strings - temporary and disabled hack

* substr_r S0, S1, start, len still returns a COW
  ref to S1, but COW flags are turned off to avoid
  COW ping-pong and memory PANICs

Recompile src/string.c with EVIL_STRING_HACK defined 
to enable it.


git-svn-id: 6e74a02f85675cec270f5d931b0f6998666294a3@10559 d31e2699-5ff4-0310-a27c-f18f2fbe73fe

ashgti/parrot,ashgti/parrot,ashgti/parrot,ashgti/parrot,ashgti/parrot,ashgti/parrot,ashgti/parrot