Added Lots of Documentation

Added some nice to haves
Improved and Unified General Code Layout

MathKit/MPSumFunctionTerm.h

@@ -8,11 +8,30 @@
 
 #import "MPFunctionTerm.h"
 
+/*!
+ @header
+ This file contains the <code>MPSumFunctionTerm</code> class.
+ */
+
 
 
 @class MPSumFunctionTerm;
 
 
+/*!
+    @class      MPSumFunctionTerm
+    @abstract   Represents and evaluates a <code>@link
+                //apple_ref/occ/cl/MPSumFunction@/link</code>.
+ 
+    @discussion A sum function evaluates its sum term <code>n</code> times. How
+                often it actually is evaluated depends on the boundary
+                expressions (start and target). Both are inclusive.
+ 
+                A sum function also features a variable that contains the current
+                value of the iteration. The variable is defined in the start
+                expression and incremented by <code>1</code> after every
+                iteration.
+ */
 @interface MPSumFunctionTerm : MPFunctionTerm
 
 @end