[Sheila, Haocun]

We began to work on guardian for squeezing automation.

- A new state "PREP_SQZ_ALIGN" was added in ALIGN_IFO. This locks OPO --> Misalign PR2, SR2; Align SRM --> open the beam diverter.

- 'SUS_SR2', 'SUS_PR2' and 'SQZ_LOCK' were added into the nodelist.