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

added feature refactoring labels

changed the description

assigned to @klinkovsky

added 1 commit

• 87ea7cbc - Split VectorVerticalOperationsTest from VectorUnaryOperationsTest

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• f4a27510 - Split VectorVerticalOperationsTest from VectorUnaryOperationsTest

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changed the description

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• 8f7ded23 - Changed argMin and argMax to return std::pair

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added 2 commits

• ee2c74d6 - Implemented Alltoall method for NoDistrCommunicator
• e4ed2628 - Implemented distributed argMin and argMax

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enabled an automatic merge when the pipeline for e4ed2628 succeeds

mentioned in commit 84b7a213

merged