* Further code refactoring
* Added "advance"d option in main interface
* Evolution can be bound to a field from a sequence ROI
* Improved block mode
* More failsafe behavior on problematic ROI
* Reduced gradient pre-smoothing to 0.5
* Reduced feedback weight to -0.1 (needs check)
* Internal forces moved with feedback forces (allows contours to move even if outside bounds)
* Convergence measure is now contour area instead of perimeter