Added description of VectorT class to tutorial 05

core/tutorial/doc/05_algebra.md

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+# Tutorial 05 - Linear Algebra
+## Vectors
+NICE provides the generic _VectorT<>_ class for vector data storage and
+calculations.
+It supports the same, large number of operations for all data types.
+
+There are deep and shallow copy functions for LinAl interoperability.
+
+### Construction
+While _VectorT<>_ provides a default constructor, it is only if you want
+to avoid pointers as member variables.
+
+_VectorT<>_ needs to know the number of elements because resizing a vector is
+extremely inefficient. You can also initialize the elements if you want to:
+
+```c++
+// This line creates an empty vector
+VectorT<double> empty_vector();
+
+// This line creates a three-dimensional vector
+// The elements are not initialized
+VectorT<double> threed_vector(3);
+
+// This line creates a two-dimensional vector
+// We initialize the elements to the value 25.3
+VectorT<double> twod_vector(3, 25.3);
+```
+
+
+### Operators
+For easy and expressive calculations, _VectorT<>_ defines the following
+classes of operators:
+
+* Unary operators:
+    - Unchecked read or reference access to element ([])
+    - Checked read or reference access to element (())
+
+* Binary operators:
+    - Vector addition and subtraction (+,-)
+    - Scalar multiplication (\*)
+
+* Combined assignment operators:
+    - Vector addition and subtraction (+=,-=)
+    - Vector multiplication and division (\*=,/=)
+    - Scalar addition and subtraction (+=,-=)
+    - Scalar multiplication and division (\*=,/=)
+
+### Methods
+In addition to basic algebra, _VectorT<>_ supports more complex operations.
+These include:
+
+* Calculating the scalar product of two _VectorT<>_: __scalarProduct__
+* Determining various statistics: __Sum__, __Mean__, __Median__, __StdDev__,
+  __Min__, __Max__
+* Additional information on these statistics: __MaxIndex__, __MinIndex__
+* Mean in non-euclidean vector spaces: __CircularMean__
+* Several norms: __normInf__, __normL1__, __normL2__
+* ...and normalization routines: __normalizeInf__, __normalizeL1__, __normalizeL2__
+* Basic sorting functions: __sortAscend__, __sortDescend__
+
+## Matrices
+Just like vectors, matrices have a generic representation in NICE.
+The class is called _MatrixT<>_ and is not related to _VectorT<>_ in that it
+is not a construct like _VectorT<VectorT<>>_.
+
+### Operators
+[...]
+### Methods
+[...]
+
+# Sample code
+[...]