Mark entire introduction to array chapter as non-normative.

As far as I could see all the normative parts were duplicated from the chapter
and thus redundant.

chapters/arrays.tex

@@ -10,23 +10,20 @@ \chapter{Arrays}\label{arrays}
 regarded as an array with zero dimensions. Vectors have one dimension,
 matrices have two dimensions, etc.
 
-\begin{nonnormative}
+
 So-called row vectors and column vectors do not exist in Modelica and cannot be distinguished since vectors have only one
 dimension.  If distinguishing these is desired, row matrices and column matrices are available, being the corresponding
 two-dimensional entities.  However, in practice this is seldom needed since the usual matrix arithmetic and linear algebra
 operations have been defined to give the expected behavior when operating on Modelica vectors and matrices.
-\end{nonnormative}
 
 Modelica is a strongly typed language, which also applies to array
 types. The number of dimensions of an array is fixed and cannot be
 changed at run-time. However, the sizes of array dimensions can
 be computed at run-time.
 
-\begin{nonnormative}
 The fixed number of array dimensions permits strong type checking and efficient implementation.  The non-fixed sizes of array
 dimensions on the other hand, allow fairly generic array manipulation code to be written as well as interfacing to standard
 numeric libraries implemented in other programming languages.
-\end{nonnormative}
 
 An array is allocated by declaring an array variable or calling an array
 constructor. Elements of an array can be indexed by \lstinline!Integer!, \lstinline!Boolean!, or