Update forward_problem network
Updates to module parameters
Don't invert normals for heart
Add button for nan default

needs better nan state handling though
Fix problems with NaN reading
Reformat
Typos
AddKnowns performance improvements

Basically speeds it up infinity %
Improve caching
Most of #418
Minor change
Naming
Clean up
Closes #418
Merge branch 'master' into modules_L_good