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/FunctionX.cpp

@@ -24,7 +24,7 @@ void MbD::FunctionX::arguments(Symsptr args)
 	xx = sum->terms->front();
 }
 
-Symsptr MbD::FunctionX::copyWith(Symsptr arg)
+Symsptr MbD::FunctionX::copyWith(Symsptr)
 {
 	assert(false);
 	return Symsptr();