lots of new stuff

Added sgn(x) to .calc

- reverted previous commit (now that was a bad idea)

- store expression and tokens as members of Calculator rather than being passed around as parameters

Major refactor: moved calculator routines into a Calculator class.

Cranked up the runaway (8 was only for testing)

(0) -100 -30 -10 -6 +6 +10 +30 tip

mercurial