Change Particle

- Give Particle default values for mass and charge
- Modify PenningTrap to use the new Particle constructor
- Modify main.cpp to use the new Particle constructor
- Modify test_suite.cpp to use the new Particle constructor

include/Particle.hpp

@@ -15,15 +15,16 @@
 #include <armadillo>
 
 #include "typedefs.hpp"
+#include "constants.hpp"
 
 /** @brief A class that holds attributes of a particle
  * */
 class Particle {
 private:
-    double q;     ///< Charge
-    double m;     ///< Mass
     vec_3d r_vec; ///< position
     vec_3d v_vec; ///< velocity
+    double q;     ///< Charge
+    double m;     ///< Mass
 
 public:
     /** @brief Initialize the particle.
@@ -36,7 +37,7 @@ public:
      *  @param r_vec The initial position of the particle
      *  @param v_vec The initial velocity of the particle
      * */
-    Particle(double q, double m, vec_3d r_vec, vec_3d v_vec);
+    Particle(vec_3d r_vec, vec_3d v_vec, double q = CA_CHARGE, double m = CA_MASS);
 
     /** @brief Make private attributes available for PenningTrap.
      * */