Ajust the meta ini files to the command syntax

dune/pdelab-systemtesting/poisson/poisson.mini

 # define some convenience variables
-dim =dim= 2#, 3
-grid =grid= yasp, ug
-degree =deg= 1, 2
+dim = 2
+grid = yasp, ug | expand grid
+degree = 1, 2 | expand deg
 naming = {grid}_{dim}d_Q{degree}
 
 # The suffix for the executable
@@ -16,16 +16,16 @@ name = poisson_{naming}
 reference = poisson_reference_{dim}d_Q{degree}
 
 [yaspgrid]
-cells =dim= 1 1#, 1 1 1
-extension =dim= 1. 1.#, 1. 1. 1.
-refinement =dim= 4#, 2
+cells = 1 1
+extension = 1. 1.
+refinement = 4
 
 [ug]
-cells =dim= 1 1#, 1 1 1
-lowerleft =dim= 0. 0.#, 0. 0. 0.
-upperright =dim= 1. 1.#, 1. 1. 1.
-refinement =dim= 4#, 2
+cells = 1 1
+lowerleft = 0. 0.
+upperright = 1. 1.
+refinement = 4
 
 [__STATIC.COMPILE_DEFINITIONS]
-GRIDTYPE =grid= Dune::YaspGrid<{dim}>, Dune::UGGrid<{dim}>
+GRIDTYPE = Dune::YaspGrid<{dim}>, Dune::UGGrid<{dim}> | expand grid
 DEGREE = {degree}
\ No newline at end of file

dune/pdelab-systemtesting/poisson/poisson_conv.mini

 # define some convenience variables
-dim =dim= 2#, 3
-grid =grid= yasp, ug
-degree =deg= 1, 2
+dim = 2
+grid = yasp, ug | expand grid
+degree = 1, 2 | expand deg
 naming = {grid}_{dim}d_Q{degree}
-level ==  1,2,3,4,5
+level =  1,2,3,4,5 | expand
 
 # The suffix for the executable
 __exec_suffix = {naming}
@@ -17,21 +17,21 @@ output = False
 name = poisson_{naming}
 
 [yaspgrid]
-cells =dim= 1 1#, 1 1 1
-extension =dim= 1. 1.#, 1. 1. 1.
+cells = 1 1
+extension = 1. 1.
 refinement = {level}
 
 [ug]
-cells =dim= 1 1#, 1 1 1
-lowerleft =dim= 0. 0.#, 0. 0. 0.
-upperright =dim= 1. 1.#, 1. 1. 1.
+cells = 1 1
+lowerleft = 0. 0.
+upperright = 1. 1.
 refinement = {level}
 
 [__STATIC.COMPILE_DEFINITIONS]
-GRIDTYPE =grid= Dune::YaspGrid<{dim}>, Dune::UGGrid<{dim}>
+GRIDTYPE = Dune::YaspGrid<{dim}>, Dune::UGGrid<{dim}> | expand grid
 DEGREE = {degree}
 
 [__CONVERGENCE_TEST]
 TestKey = level
-ExpectedRate =deg= 2, 3
+ExpectedRate = 2, 3 | expand degree
 AbsoluteDiff = 0.1
\ No newline at end of file