Fixes over cut, serializing, and others

We want to release soon 1.2 and was expected to be done this week but some (blocker) bugs makes us to rethink our position. By blocker we mean that over some complexity the Cut goes to recursive infinite call, also it does mean that some undo/redo work was completely wrong. Those two days was a complete team work by targeting those hard issues.

We are close with that bugs but we aren't still to do a release. This means that we will want to make it in some days next week, who knows, maybe Monday but also we want that you to not find big crashes or miss of functionality. In fact the functionality that splits faces that gives problems is a huge gain from user point of view to define islands and sections of a shape.