update
 On branch ch12
	modified:   ch12/README
add transplant
 On branch ch12
	modified:   ch12/binary_search_tree.hpp
replace positions of from and to
 On branch ch12
	modified:   ch12/binary_search_tree.hpp
add pseudo code for delete()
 On branch ch12
	modified:   ch12/binary_search_tree.hpp
add remove(), not tested yet.
 On branch ch12
	modified:   ch12/binary_search_tree.hpp
test delete()
 On branch ch12
	modified:   ch12/README
	modified:   ch12/binary_search_tree.hpp
update
 On branch ch12