Fix button label position, try number 2

Create and use BLayoutUtils::AlignOnRect() to position the button label
in BControlLook::DrawLabel().

AlignOnRect(), unlike AlignInFrame(), provides the possibility to return
a rectangle with dimensions greater than the available size.

Add some comments above the methods in LayoutUtils that indicate such.

Also update copyright headers in LayoutUtils and ControlLook

headers/os/interface/LayoutUtils.h

@@ -1,5 +1,5 @@
 /*
- * Copyright 2006-2013, Haiku, Inc. All rights reserved.
+ * Copyright 2006-2014 Haiku, Inc. All rights reserved.
  * Distributed under the terms of the MIT License.
  */
 #ifndef	_LAYOUT_UTILS_H
@@ -40,6 +40,7 @@ public:
 	static	BRect				AlignInFrame(BRect frame, BSize maxSize,
 									BAlignment alignment);
 	static	void				AlignInFrame(BView* view, BRect frame);
+	static	BRect				AlignOnRect(BRect rect, BSize size, BAlignment alignment);
 	static	BRect				MoveIntoFrame(BRect rect, BSize frameSize);
 
 	// debugging