For validation benchmarking it is often convenient to disable script checks to isolate script evaluation performance (and in particular signature verification) from other issues.
This PR adds a command line option -checkscripts that defaults to true (preserving the original behavior) but can be set to false to shortcircuit script evaluation.
NAK; sorry. Not a supported configuration, and I believe it should not be one: it has high risk of being effectively an attractive nuisance where most of the time things will be fine, but then bite you (and others). Better to just adjust the bench instrumentation to provide accounting for it, which is enough for 99% of bench purposes.
This also bypasses all the soft-verify check stuff, like nop-non-standardness; which is a pretty dangerous thing to do; and could have bad effect network wide if some hypermiler decides to turn it on in their mining setup.