add intersectionsize function. #550
add intersectionsize function. #550

bmesuere/uni-test,unipept/unipept,bmesuere/uni-test,unipept/unipept,bmesuere/uni-test,bmesuere/uni-test,unipept/unipept,unipept/unipept,unipept/unipept,bmesuere/uni-test