First step towards reading .vtu mesh

Just setting up the required functions.

src/modules/mesh/inout/0D/moduleMeshOutput0D.f90

@@ -42,13 +42,13 @@ MODULE moduleMeshOutput0D
       USE moduleOutput
       IMPLICIT NONE
 
-      CLASS(meshGeneric), INTENT(inout):: self
+      CLASS(meshGeneric), INTENT(in):: self
       INTEGER, INTENT(in):: t
       CHARACTER(:), ALLOCATABLE:: fileName
       INTEGER:: k
 
       fileName='OUTPUT_Collisions.dat'
-      IF (t == 0) THEN
+      IF (t == tInitial) THEN
         OPEN(20, file = path // folder // '/' // fileName, action = 'write')
         WRITE(20, "(A1, 14X, A5, A20)") "#","t (s)","collisions"
         WRITE(*, "(6X,A15,A)") "Creating file: ", fileName