First commit of branch performance:

Bugs fixed:
- Solved an issue with particles being injected with infinite velocity
  resulting in Inf velocity in some cells of the output files.
- Particles are now equally distributed in cylindrical geometry along
  the radial direction.

New features:
- Particles now have their own weight that is recalculated when the
  particle moves to a new cell. This avoid the reduction of density at
  r = 0.

Cases:
- Added a case of Argon flow around a cylinder to measure performance
  and future improvements.

src/modules/moduleOutput.f95

@@ -60,9 +60,12 @@ MODULE moduleOutput
       formatValues%velocity    = 0.D0
       formatValues%pressure    = 0.D0
       formatValues%temperature = 0.D0
-      tempVol = speciesIn%weight/(nodeVol*Vol_ref)
+      tempVol = 1.D0/(nodeVol*Vol_ref)
       IF (rawValues%den > 0.D0) THEN
         tempVel    =  rawValues%mom(:)/rawValues%den
+        IF ((tempVel(1) - 1.D0) .EQ. tempVel(1)) THEN
+          PRINT *, rawValues%mom
+        END IF
         tensorTemp = (rawValues%tensorS(:,:) - rawValues%den*outerProduct(tempVel,tempVel))
         formatValues%density     = rawValues%den*tempVol
         formatValues%velocity(:) = tempVel