update module dependencies in code with side effects

[rksm]

export var i = 0;
function inc() { i = i+1 }

Running inc should
a) update the exported value for i (what you get when running System.import(...)) and
b) update all dependent modules that import i

This is currently not working b/c we trigger re-exports using a evaluationDone() call at the end of module executions (compiled in as part of rewriting) and evals via lively.vm.

[rksm]

fixed by d1c5702

[rksm]

Note that there is an issue with var modifications that aren't assignments such as i++ or i+=1. Since we don't use getters/setters in the recorder anymore, those changes will not trigger an export notification b/c they aren't jet wrapped by our declaration wrapper. This issue is tracked here: LivelyKernel/lively.ast#8