[SCIP] spx vs spx1

[Stuart Rogers]

I use SCIP through GAMS, for which soplex2 or soplex can be used as the LP
solver: https://www.gams.com/latest/docs/S_SCIP.html#SCIP_OPTIONS. For GAMS
SCIP, I believe soplex2 calls the new interface spx, while soplex calls the
older interface spx1. In my tests solving a MINLP with GAMS SCIP, I find
that SCIP converges more rapidly when using soplex (which uses the older
interface) compared to soplex2 (which uses the newer interface). Can you
explain this? Thanks, Stuart
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