Adapt to upstream changes.

dune/pdelab-systemtesting/poisson/CMakeLists.txt

 add_dune_system_test(BASENAME poisson
                      INIFILE poisson.mini
                      SOURCE poisson_uniform.cc
-                     TARGETS output
+                     CREATED_TARGETS output
                      SCRIPT ${DUNE_TESTTOOLS_PATH}/python/wrapper/vtkcompare.py)
 
-#add_dune_convergence_test(BASENAME poisson
-#                          TARGET ${output}
-#                          INIFILE poisson_conv.mini)
+add_dune_system_test(BASENAME poisson
+                     TARGET ${output}
+                     INIFILE poisson_conv.mini
+                     SCRIPT ${DUNE_TESTTOOLS_PATH}/python/wrapper/convergencetest.py)
\ No newline at end of file

dune/pdelab-systemtesting/poisson/poisson.mini

 # define some convenience variables
 dim = 2
 grid = yasp, ug | expand grid
-degree = 1, 2 | expand deg
+degree = 1
 naming = {grid}_{dim}d_Q{degree}
 level = 4
 
 # The suffix for the executable
 __exec_suffix = {naming}
 
-outputFile = output_{naming} | output_name
+#outputFile = output_{naming} | output_name
 computeError = false
 
 [vtk]
@@ -27,8 +27,6 @@ lowerleft = 0. 0.
 upperright = 1. 1.
 refinement = {level}
 
-[__static.COMPILE_DEFINITIONS]
+[__static]
 GRIDTYPE = Dune::YaspGrid<{dim}>, Dune::UGGrid<{dim}> | expand grid
 DEGREE = {degree}
-
-{grid} == yasp | label YASP GRIDLABEL

dune/pdelab-systemtesting/poisson/poisson_conv.mini

 include poisson.mini
 
-level =  1,2,3,4,5 | convergence_test
+level =  1,2,3,4,5 | convergencetest
 
-__name = {naming}_lev{level}
+__name = conv_{naming}
 
-outputFile = {__name}.output
 computeError = true
 vtk.output = false
 
-[__CONVERGENCE_TEST]
-ExpectedRate = 2, 3 | expand deg
-AbsoluteDiff = 0.1
-NormType = l2norm
-QuantityName = hmax
+2 | convergencetest rate
+0.1 | convergencetest diff
+l2norm | convergencetest norm_outputkey
+hmax | convergencetest scale_outputkey
+myout | convergencetest output_extension
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