gitignore
Update measurement using DATAPOOL

update measurement subroutines. check Ising model ok.
Measurement with huge tensor, Collect free energy and entropy.

1. Add measurement subroutine for the huge tensor (grow with the MPO
tensor), such that AKLT state can be measured.

2. Add free energy and entanglement entropy record space in the
DATAPOOL and finish its recording system.

3. update SET_MPO. now SET_MPO does not make MPO by itself, but take in
MPO from input and depose it to the DATAPOOL.

4. write MPO making routine for the AKLT state.