changed checkForTwoAxes to a more elaborate context-guessing method so a Scaler can switch to using hstem rather than vstem values if they are the only values with differential.
changed checkForTwoAxes to a more elaborate context-guessing method so a Scaler can switch to using hstem rather than vstem values if they are the only values with differential.

loicsander/MutatorScale,moyogo/mutatorscale