- clean up GModel API (xxByTag -> getXx, numXx -> getNumXxes, ...)

make it easier to see when char lengths are bad

move the release/debug test in variables.msvc (+ rewrote in a different way)

bug fix: even when a For/EndFor loop was not entered, we still increased
ImbricatedLoop. This could lead to undefined behaviour with nested loops

ooops!

Smoother Surface{list} = numsteps;