Renamed baseline files for windows compatibility

tests/calc_system/conftest.py

@@ -17,7 +17,7 @@
 @pytest.fixture(
     scope='module',
     params=l,
-    ids=['LATT:' + str(a) for a in l]
+    ids=['LATT_' + str(a) for a in l]
     )
 def base(request):
     return basis[request.param]
@@ -26,7 +26,7 @@ def base(request):
 @pytest.fixture(
     scope='module',
     params=l,
-    ids=['#ATM:' + str(a) for a in l]
+    ids=['#ATM_' + str(a) for a in l]
     )
 def coord(request):
     return coords[:request.param]

tests/calc_system/t_structure.py

@@ -16,7 +16,7 @@ def cls_wcc(self, cls_rec, coord):
         return cls_rec
 
     @pytest.mark.mpl_image_compare
-    @pytest.mark.parametrize('rep', [1,2,3], ids=['rep:' + str(a) for a in [1,2,3]])
+    @pytest.mark.parametrize('rep', [1,2,3], ids=['rep_' + str(a) for a in [1,2,3]])
     def test_plot_cell(self, cls_wcc, rep):
         import matplotlib.pyplot as plt
         from mpl_toolkits.mplot3d import Axes3D