* To-do items for broader platform/go-version benchmarking
* neaten inferrer API
* extend type-inference unit-test cases
* Add benchmark scripts for comparing compiler versions
* mlr version in addition to mlr --version
* some go-benchmark files for Mac/Linux perf comparisons
* neaten perf-scripts
* merge
* type-scan optimization tests
* type-scan optimization infra
* test new inferrer
* mlr --time option
* include --cpuprofile and --traceprofile in on-line help
* sharpen inferred/deferred-type API distinction
* replace old inferrer with newer/faster
* update docs for new type-inferrer
