Minor tweaks and fixes.

- Fixed the Exception Handler to reset the list of applicable delegates so that it gets reconstructed at the next call to handle();
- Made a stack Frame easier to serialize and convert to other formats;
- Added a protected isFatal method on the Error Handler to make it easier to override if you want to decide on your own which fatal errors should be handled;
- Started additional work on Profiling;
- CS / docblocks;