is leaf
search tree
bug fix. isLeaf error
insert not full
testcase for add and split
bug fix. copyItemsAndChild
fix copy start point eror
fix fold error. remove \M
rm add_in_root
update testcase about insert. add full test
insert while full. split
fix bugs and add testcase about addItemAndSplit
set child index
insert. parent as root
add test case on insert
new testcase on insert_deep
rm 1 run
spelling fix
fix node search bug
update rootInfo after insert