Fixed expression templates

Brief summary:

• fixed DistributedExpressionTemplates
• many fixes and simplifications in ExpressionTemplates and StaticExpressionTemplates
• extended tests (unified for VectorExpressions, VectorViewExpressions, StaticVectorExpressions, DistributedVectorExpressions, DistributedVectorViewExpressions)
• functions maxNorm, l1Norm and l2Norm - convenient aliases for max(abs(...)), lpNorm(..., 1) and lpNorm(..., 2)
• a cast function which makes something like this possible: float s = TNL::sum(cast<float>(vector)), where vector elements may be int, double, etc.
• fixed result types in expression templates and vertical operations
• removed addVector, addVectors, addElement, scalarProduct and sum methods from all vector types