Ramon benchmark for Z3
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Job description: 
Job tag: qf-nia-small-master
Runner: rise-runner-1
Z3 repo: Z3Prover/z3
Z3 commit: cd6fad428b2656d4ba99371cd14b9e0b4cbb5981
Z3 branch: master
Z3 options: "-T:30"
Z3 inputs: inputs/QF_NIA_small
Z3 commit message: code review updates

1. unit extraction could skip some units
2. create a shared method to check satisfiability that handles exception cases. They are the same among different workers, so shared in the batch manager.
