Added Lots of Documentation

Added some nice to haves
Improved and Unified General Code Layout

MathKit/MPSumFunctionLayout.h

@@ -9,12 +9,33 @@
 #import "MPFunctionLayout.h"
 
 
+/*!
+ @header
+ This file contains the <code>MPSumFunctionLayout</code> class.
+ */
+
+
 
 @class MPSumFunctionLayout, MPSumFunction;
 
 
+/*!
+    @class      MPSumFunctionLayout
+    @abstract   A sum function layout displays a <code>@link
+                //apple_ref/occ/cl/MPSumFunction@/link</code>.
+ 
+    @discussion A sum is drawn using a capital greeg sigma (∑) The three children
+                are placed around it: The start expression below, target
+                expression above and sum expression to the right of it.
+ */
 @interface MPSumFunctionLayout : MPFunctionLayout
 
+/*!
+    @method     sumFunction
+    @abstract   Returns the <code>@link
+                //apple_ref/occ/cl/MPSumFunction@/link</code> represented by the
+                receiver.
+ */
 - (MPSumFunction *)sumFunction;
 
 @end