added withMsg to History and created exec/hlearn-allknn-bench.hs

[tonyday567]

56

I created a new executable (hlearn-allknn-bench.hs) rather than edit the original. There's a few gotchas/fails with what I have so far:

• I couldnt work out what to do with the disableMultithreading so I deleted it.
• The new timings look like they're being reported 1 behind. Don't know why but a simpler example would tease that bug out.
• I tried to withMsg'ify the loadfile section, and change the allknn type sig to take a History, but I ran into an escaped scope. Maybe the context stuff only works if you have exactly 1 use floating around.

[mikeizbicki]

Thanks for doing this! I've just glanced through, and the big picture ideas look good.

It'll probably be a few days before I can look at this in more detail though. If I haven't gotten back to you by next week, ping me again.