cookie name will keep original case
multi,list,tree support flush/tmp.rows
tree support 3 .n API, rename content to cur

1. tree.o, tree.n, tree.c to make tree structure
2. tree.n(level plsql_integer, str)
3. tree.n(level indent str, str)
4. tree.n(level indent str)
5. add demos
6. multi add function version of m.r (join)