Bugs when setting a small page size

[DevidXu]

Thanks for sharing at first! Here I want to point out a bug. When I change the PAGE_SIZE in src/include/common/config.h to some small value (like 96), the Random Test will fail.
cd build
make b_plus_tree_test
./test/b_plus_tree_test
When PAGE_SIZE is 96, the max size of leaf page is 4 and max size of internal page is 5. I rewrote this project inspired by your codes and can pass all test cases even with a small page size.

[xingdl2007]

Thanks for pointing it out, I will check it soon

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