add new function spaces
nodeForth: if a require fails don't abort the start process
add /** */ comments
add functions lshift and rshift
remove dead code
fix not and invert, improve xor
add negate
add 2* and 2/
remove js code from >r
dup,swap,over,rot,-rot,tuck,nip,2dup,2swap, and 2over didn't correctly handle functions on the stack
fix and move examples from tests to examples
fix and upate the tests, they can no be executed using include tests.fs