Most of modules organized

Most of the modules are organized in subfolders.

Maybe some big re-organization is needed in the future, but for now I am
happy.

src/modules/common/moduleParallel.f90

@@ -0,0 +1,22 @@
+MODULE moduleParallel
+  IMPLICIT NONE
+  
+  TYPE openMP_type
+    INTEGER:: nThreads
+
+  END TYPE
+
+  TYPE(openMP_type):: openMP
+
+  CONTAINS
+    SUBROUTINE initParallel()
+      IMPLICIT NONE
+
+      EXTERNAL:: OMP_SET_NUM_THREADS
+
+      !Starts threads for OpenMP parallelization
+      CALL OMP_SET_NUM_THREADS(openMP%nThreads)
+
+    END SUBROUTINE initParallel
+
+END MODULE moduleParallel