add newline after dump printout.
if __DEBUG_SHOW_ is defined, then address of every value is shown with tracing.
renamed tests - tests for reusable stuff is in lib.
copy reference bug - now support linked lists ;-)
now allow assignment of Null reference to defined value.
rename 'skip' keyword into 'next' - wow I don't have a test for that !
Move tests
break in for loop did not work - crashed. fixed.