[mpnc][test] Replace unnecessary dgf files by input files

test/porousmediumflow/mpnc/implicit/grids/forchheimer1d.dgf

-DGF
-Interval
-0    % first corner
-1   % second corner
-100   % 24 cells in x and 16 in y direction
-#
-GridParameter
-overlap 0
-periodic
-closure green
-#GridParameter
-BOUNDARYDOMAIN
-default 1    % all boundaries have id 1
-#BOUNDARYDOMAIN
-# unitcube.dgf

test/porousmediumflow/mpnc/implicit/grids/obstacle_24x16.dgf

-DGF
-Interval
-0 0   % first corner
-60 40   % second corner
-24 16   % 24 cells in x and 16 in y direction
-#
-GridParameter
-overlap 0
-periodic
-closure green
-#GridParameter
-BOUNDARYDOMAIN
-default 1    % all boundaries have id 1
-#BOUNDARYDOMAIN
-# unitcube.dgf

test/porousmediumflow/mpnc/implicit/grids/obstacle_48x32.dgf

-DGF
-Interval
-0 0   % first corner
-60 40   % second corner
-48 32   % 24 cells in x and 16 in y direction
-#
-GridParameter
-overlap 0
-periodic
-closure green
-#GridParameter
-BOUNDARYDOMAIN
-default 1    % all boundaries have id 1
-#BOUNDARYDOMAIN
-# unitcube.dgf

test/porousmediumflow/mpnc/implicit/test_boxmpnc.input

@@ -3,7 +3,8 @@ DtInitial = 250 # [s]
 TEnd = 1e4 # [s]
 
 [Grid]
-File = ./grids/obstacle_24x16.dgf
+UpperRight = 60 40
+Cells = 24 16
 
 [LinearSolver]
 ResidualReduction = 1e-12

test/porousmediumflow/mpnc/implicit/test_ccmpnc.input

@@ -3,7 +3,8 @@ DtInitial = 250 # [s]
 TEnd = 1e4 # [s]
 
 [Grid]
-File = ./grids/obstacle_24x16.dgf
+UpperRight = 60 40
+Cells = 24 16
 
 [LinearSolver]
 ResidualReduction = 1e-12

test/porousmediumflow/mpnc/implicit/test_forchheimer1p.input

@@ -3,7 +3,8 @@ DtInitial = 1e7 # [s]
 TEnd =     1e7 # [s]
 
 [Grid]
-File = ./grids/forchheimer1d.dgf
+UpperRight = 1
+Cells = 100
 
 [Problem]
 pMin 		= 1e5

test/porousmediumflow/mpnc/implicit/test_forchheimer2p.input

@@ -3,10 +3,11 @@ DtInitial = 330 # [s]
 TEnd =     3e3 # [s]
 
 [Grid]
-File = ./grids/obstacle_24x16.dgf
+UpperRight = 60 40
+Cells = 24 16
 
 [Problem]
-pMin 		=    1e5
+pMin 		= 1e5
 pMax 		= 42e5
 outputName 	= test_forchheimer2p