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/Power.cpp

@@ -35,7 +35,7 @@ Symsptr MbD::Power::differentiateWRTy()
 	return deriv->simplified();
 }
 
-Symsptr MbD::Power::simplifyUntil(Symsptr sptr, std::shared_ptr<std::unordered_set<Symsptr>> set)
+Symsptr MbD::Power::simplifyUntil(Symsptr, std::shared_ptr<std::unordered_set<Symsptr>>)
 {
 	assert(false);
 	return Symsptr();