First attempt at Coulomb collisions

First attemp for Coulomb collisions based on the moments distribtuions.
Still the method is not done and far from being complete but input
options and basic math are implemented.

src/modules/solver/moduleSolver.f90

@@ -322,7 +322,7 @@ MODULE moduleSolver
 
       !$OMP SECTION
       !Erase the list of particles inside the cell if particles have been pushed
-      IF (doMCC) THEN
+      IF (listInCells) THEN
         DO s = 1, nSpecies
           DO e = 1, mesh%numCells
             IF (solver%pusher(s)%pushSpecies) THEN 
@@ -456,7 +456,7 @@ MODULE moduleSolver
         CALL partWScheme%unsetLock()
         !Add particle to cell list
         sp = part%species%n
-        IF (doMCC) THEN
+        IF (listInCells) THEN
           CALL OMP_SET_lock(cell%lock)
           CALL cell%listPart_in(sp)%add(newPart)
           CALL OMP_UNSET_lock(cell%lock)