Added source indicators from FIRRTL files. Pass in -p i to get them printed. Should show up with check passes

firrtl + flo now working with tutorial examples

Now when expanding ConnectFrom/ToIndex, create a node for the index so it isn't duplicated for all the whens

Fixed performance bug where PlusWidth, MinusWidth, and ExpWidth could be simplified earlier, and also now have equal? defined so mMaxWidth doesn't blow up during width inference

Made temp name generation counter, as well as the name, based off the eventual named assignment. Should be very clear what caused the generation of the temp, and the numbering is based off of that cause, not a global counter