more joinedvector tests
docs and tidying
coalesce arrayvector joining
adjavent avector joining
joinedarrayvector optimisations
special vector tests for rejoining subvectors
tests and minor fixes
Vector2 add override
add overrides
tidy
cull Vector2.setValues
setElements functionality with double arrays
arrayvector setElements
test setElements
JoinedVector setElements
JoinedArrayVector setElements