Add --fail-fast and --maintainence-rate pyk flags
#900
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--fail-fastwill terminate a proof if any branch fails (instead of continuing on other branches);--maintainence-rate <RATE>whereRATEis an integer and1 <= RATEandRATEis how many steps between writing to proof state to disc. Writing to disc is slow, so this increases performance at the cost of an interrupted proof needing to redo work that was not written to disc.