Merge branch 'cleanup/remove-symbol-2' into 'master'

Remove symbol (didn't rebase the first time)

I didn't rebase the first time so I missed some new symbols comming from nonlinear jacobian apply.

See merge request !33

python/dune/perftool/pdelab/signatures.py

@@ -337,7 +337,6 @@ def jacobian_apply_skeleton_signature():
             ]
 
 
-@symbol
 def nonlinear_jacobian_apply_volume_signature():
     geot = type_geometry_wrapper()
     geo = name_geometry_wrapper()
@@ -372,7 +371,6 @@ def nonlinear_jacobian_apply_volume_signature():
             ]
 
 
-@symbol
 def nonlinear_jacobian_apply_boundary_signature():
     geot = type_geometry_wrapper()
     geo = name_geometry_wrapper()
@@ -407,7 +405,6 @@ def nonlinear_jacobian_apply_boundary_signature():
             ]
 
 
-@symbol
 def nonlinear_jacobian_apply_skeleton_signature():
     geot = type_geometry_wrapper()
     geo = name_geometry_wrapper()