[Parmmg] Replace git lfs with zip (KratosMultiphysics#81)

* Splitting skin into zips

* Adding check to make sure skin building was unzipped

* Adding unzip instruction to reade

* Delete .gitattributes

parmmg_remeshing_examples/use_cases/embedded_level_set_building3D/README.md

@@ -12,7 +12,11 @@
 
 **Application dependencies:** `FluidDynamicsApplication`, `LinearSolversApplications`, `MeshingApplication`, `MetisApplication`, `TrilinosApplication`
 
-To run this example execute:
+To run this example, please first unzip the file:
+
+[skin_building.zip](source/skin_building.zip)
+
+ And then execute:
 
     export OMP_NUM_THREADS=1
     mpirun -n nprocs python3 MainKratos.py

parmmg_remeshing_examples/use_cases/embedded_level_set_building3D/source/MainKratos.py

@@ -70,8 +70,10 @@ def __init__(self,model,project_parameters, remeshing_parameters):
         self.skin_model_part.ProcessInfo.SetValue(KratosMultiphysics.DOMAIN_SIZE, self.project_parameters["solver_settings"]["domain_size"].GetInt())
         self.skin_model_part.AddNodalSolutionStepVariable(KratosMultiphysics.VELOCITY)
         self.skin_model_part.AddNodalSolutionStepVariable(KratosMultiphysics.FLAG_VARIABLE)
-
-        KratosMultiphysics.ModelPartIO('skin_building').ReadModelPart(self.skin_model_part)
+        try:
+            KratosMultiphysics.ModelPartIO('skin_building').ReadModelPart(self.skin_model_part)
+        except:
+            raise(Exception("skin_building.mdpa not found. Please check that you have unzipped the file skin_building.zip"))
 
     def InitializeGeometry(self):
         # Computing continuous distance required to compute the metric (only on intersected elements)