Ionization boundary condition fully tested.

Documentation updated properly.

3D Cartesian geometry also tested.
Documentation updated properly.

Added weighting probability in the injection of particles.

src/modules/moduleRandom.f90

@@ -66,4 +66,18 @@ MODULE moduleRandom
 
     END FUNCTION randomMaxwellian
 
+    !Returns a random number weighted with the cumWeight array
+    FUNCTION randomWeighted(cumWeight, sumWeight) RESULT(rnd)
+      IMPLICIT NONE
+
+      REAL(8), INTENT(in):: cumWeight(1:)
+      REAL(8), INTENT(in):: sumWeight
+      REAL(8):: rnd0b
+      INTEGER:: rnd
+
+      rnd0b = random(0.D0, sumWeight)
+      rnd = MINLOC(DABS(rnd0b - cumWeight), 1)
+
+    END FUNCTION randomWeighted
+
 END MODULE moduleRandom