Implementation of ionization process.

Now collisions can have a different time step.

Added species name to output names as it was starting to get confusing
in Gmsh for multiple species.

Output filenames adapted to match any number of iterations.

src/fpakc.f90

@@ -7,6 +7,7 @@ PROGRAM fpakc
   USE moduleSolver
   USE moduleOutput
   USE moduleCompTime
+  USE moduleCollisions
   USE moduleMesh
   IMPLICIT NONE
 
@@ -59,7 +60,7 @@ PROGRAM fpakc
     tColl = omp_get_wtime()
     !$OMP END SINGLE
 
-    CALL doCollisions()
+    CALL doCollisions(t)
 
     !$OMP SINGLE
     tColl = omp_get_wtime() - tColl