Gear merge pressure floor and GEAR star formation

Here I am moving around some piece of the code in order to clean up a bit my work.

I am mostly removing the iact part of the star formation in order to put it inside the pressure floor.

Matthieu, I will assign this merge request to you once it is finished (should be done before tomorrow).

src/hydro/AnarchyDU/hydro.h

@@ -822,9 +822,11 @@ __attribute__((always_inline)) INLINE static void hydro_reset_acceleration(
  *
  * @param p The particle.
  * @param xp The extended data of this particle.
+ * @param cosmo The cosmological model.
  */
 __attribute__((always_inline)) INLINE static void hydro_reset_predicted_values(
-    struct part *restrict p, const struct xpart *restrict xp) {
+    struct part *restrict p, const struct xpart *restrict xp,
+    const struct cosmology *cosmo) {
 
   /* Re-set the predicted velocities */
   p->v[0] = xp->v_full[0];