First pass at speeding up CF automation

[tanyongkiam]

Work done by @dnezam

[dnezam]

The harder fixes are courteousy of @tanyongkiam :)

Judging by #345 , we already suspected that the simplifier could cause bad performance. What I observed in TextIOProof was that some CFML tactic invocations spent an overwhelming amount of time in the simplifier. The "fix" was to use a "weaker" simplifier (e.g., something like srw_ss() or std_ss, or just rewrite_tac) and to tweak other parts of the tactics to get closer to the original result.

I sadly didn't record a before and after, but I think the speed up is something like going 30min to 10min for TextIOProof.

[ordinarymath]

I think it was 30 mins roughly before I did the lift out REWR_CONV _ calls in the arith decision procedures and it got to slightly more than 20 mins.