KiwiControl: Add new utility functions

Added functions:
  - CGPoint KSCenterPointInViewBounds(UIView * view) ;
  - CGPoint KSAbsolutePointAtView(UIView * view, CGPoint point) ;
PzSheetView: Change label touch delegate

[before]
  (void) touchLabelAtIndex: (NSUInteger) index ;
[after]
  (void) touchLabelAtIndex: (NSUInteger) index atAbsolutePoint: (CGPoint) point ;