handle update within insert
	do lookup with pointer-to-pointer
	modified:   src/.config/pbook/phonebook
	modified:   src/btree/btree.c
	modified:   src/cgi/client/pbkc.c
	modified:   src/cgi/pbkc
	modified:   src/include/btree.h
	modified:   src/include/debug.h
	modified:   src/socket/skts.c