feat(meshIO): LinearRescale method added

Rescaling a mesh by a linear transformation is a useful option so that we can start with a single "base" mesh and then rescale it to the dimensions needed for our problem. This commit adds the LinearRescale option too meshIO so that a unit sphere can be turned into a sphere of arbitrary radius (as an example).

src/poly/solver/private/polySolver.cpp

@@ -18,7 +18,7 @@ const std::string SPHERICAL_MESH = std::string(getenv("MESON_SOURCE_ROOT")) + "/
 PolySolver::PolySolver(double n, double order)
 : n(n),
   order(order),
-  meshIO(SPHERICAL_MESH),
+  meshIO(SPHERICAL_MESH, 5),
   mesh(meshIO.GetMesh()),
   feCollection(std::make_unique<mfem::H1_FECollection>(order, mesh.SpaceDimension())),
   feSpace(std::make_unique<mfem::FiniteElementSpace>(&mesh, feCollection.get())),
@@ -33,6 +33,7 @@ PolySolver::PolySolver(double n, double order)
     }())),
   nonLinearSourceCoeff(std::make_unique<mfem::ConstantCoefficient>(1.0)),
   gaussianCoeff(std::make_unique<polyMFEMUtils::GaussianCoefficient>(0.1)) {
+    
     assembleNonlinearForm();
     assembleConstraintForm();
 }