add op_DUP_TOP
remove some debug statements
consolidate close (no need to assign watcher)
added op_SLICE_PLUS_0 and test
update op_SLICE_PLUS_3
add op_ROT_FOUR
add op_STORE_SLICE_PLUS_[0, 1, 2, 3] and tests
add test for DUP_TOP
add inplace op test