[2p2c] remove implicit folder level

dumux/porousmediumflow/2p2c/CMakeLists.txt

-add_subdirectory("implicit")
 add_subdirectory("sequential")
+
+#install headers
+install(FILES
+indices.hh
+model.hh
+primaryvariableswitch.hh
+volumevariables.hh
+vtkoutputfields.hh
+DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}/dumux/porousmediumflow/2p2c/implicit)

dumux/porousmediumflow/2p2c/implicit/CMakeLists.txt

-
-#install headers
-install(FILES
-indices.hh
-model.hh
-primaryvariableswitch.hh
-volumevariables.hh
-vtkoutputfields.hh
-DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}/dumux/porousmediumflow/2p2c/implicit)

dumux/porousmediumflow/co2/model.hh

@@ -25,7 +25,7 @@
 #define DUMUX_TWOP_TWOC_CO2_MODEL_HH
 
 #include <dumux/common/properties.hh>
-#include <dumux/porousmediumflow/2p2c/implicit/model.hh>
+#include <dumux/porousmediumflow/2p2c/model.hh>
 #include "primaryvariableswitch.hh"
 #include "volumevariables.hh"
 

dumux/porousmediumflow/co2/volumevariables.hh

@@ -26,7 +26,7 @@
 #define DUMUX_CO2_VOLUME_VARIABLES_HH
 
 #include <dumux/common/properties.hh>
-#include <dumux/porousmediumflow/2p2c/implicit/volumevariables.hh>
+#include <dumux/porousmediumflow/2p2c/volumevariables.hh>
 
 namespace Dumux
 {

test/porousmediumflow/2p2c/implicit/injectionproblem.hh

@@ -29,7 +29,7 @@
 #include <dumux/discretization/box/properties.hh>
 
 #include <dumux/porousmediumflow/problem.hh>
-#include <dumux/porousmediumflow/2p2c/implicit/model.hh>
+#include <dumux/porousmediumflow/2p2c/model.hh>
 #include <dumux/material/fluidsystems/h2on2.hh>
 
 #include "injectionspatialparams.hh"

test/porousmediumflow/2p2c/implicit/waterairproblem.hh

@@ -31,7 +31,7 @@
 
 #include <dumux/material/components/n2.hh>
 #include <dumux/material/fluidsystems/h2on2.hh>
-#include <dumux/porousmediumflow/2p2c/implicit/model.hh>
+#include <dumux/porousmediumflow/2p2c/model.hh>
 #include <dumux/porousmediumflow/problem.hh>
 
 #include "waterairspatialparams.hh"