modify code to suppress or fix warnings in gcc and clang (#41)

* first fix to start branch PR

* explicit conversion from sizet to int

* Array.h and DiagonalMatrix.h

* many sizet to int conversions

* removed some unused variables and added expl overrides

* removed many unused parameters

* more typing

* even more

* last of the easy changes

OndselSolver/DifferenceOperator.cpp

@@ -18,7 +18,7 @@ using namespace MbD;
 
 FRowDsptr DifferenceOperator::OneOverFactorials = []() {
 	auto oneOverFactorials = std::make_shared<FullRow<double>>(10);
-	for (int i = 0; i < oneOverFactorials->size(); i++)
+	for (int i = 0; i < (int)oneOverFactorials->size(); i++)
 	{
 		oneOverFactorials->at(i) = 1.0 / std::tgamma(i + 1);
 	}