Werner compil warning (#32)

* Replace int by size_t in for loops.

* Various dtor missing and some other warning fixes.

* fixed size_t vs int

* fixed size_t vs int

---------

Co-authored-by: Paddle <PaddleStroke@users.noreply.github.com>
Co-authored-by: Aik-Siong Koh <askoh@askoh.com>

OndselSolver/FullRow.cpp

@@ -66,7 +66,7 @@ namespace MbD {
     FRowsptr<double> FullRow<double>::timesFullMatrix(std::shared_ptr<FullMatrixDouble> fullMat)
     {
         FRowsptr<double> answer = fullMat->at(0)->times(this->at(0));
-        for (int j = 1; j < (int) this->size(); j++)
+        for (size_t j = 1; j < this->size(); j++)
         {
             answer->equalSelfPlusFullRowTimes(fullMat->at(j), this->at(j));
         }