Probes in 0 iteration

Probes are now written at the 0 iteration.

Additionally, and this shouldn't be done, some small changes to the quad
elements. This should be done in a separate commit, but I'm lazy.

src/modules/mesh/2DCart/moduleMesh2DCart.f90

@@ -508,7 +508,7 @@ MODULE moduleMesh2DCart
       conv = 1.D0
       XiO  = 0.D0
 
-      DO WHILE(conv > 1.D-2)
+      DO WHILE(conv > 1.D-4)
         dPsi = self%dPsi(XiO, 4)
         pDer = self%partialDer(4, dPsi)
         detJ = self%detJac(pDer)
@@ -516,8 +516,7 @@ MODULE moduleMesh2DCart
         fPsi = self%fPsi(XiO, 4)
         f = (/ DOT_PRODUCT(fPsi,self%x), &
                DOT_PRODUCT(fPsi,self%y), &
-               0.D0 /)
-        f = f - r
+               0.D0 /) - r
         Xi = XiO - MATMUL(invJ, f)/detJ
         conv = MAXVAL(DABS(Xi-XiO),1)
         XiO = Xi