A small test for the output streams.

[[Imported from SVN: r6593]]

cmake/modules/DuneStreams.cmake

+macro(dune_set_minimal_debug_level)
+set(MINIMAL_DEBUG_LEVEL ON CACHE STRING "set the MINIMAL_DEBUG_LEVEL. Standard debug streams with level below MINIMAL_DEBUG_LEVEL will collapse to doing nothing if output is requested. (default=warn)")
+set_property(CACHE MINIMAL_DEBUG_LEVEL PROPERTY STRINGS
+  "grave" "warn" "info" "verb" "vverb")
+if(MINIMAL_DEBUG_LEVEL MATCHES "grave")
+  set(DUNE_MINIMAL_DEBUG_LEVEL 5)
+elseif(MINIMAL_DEBUG_LEVEL MATCHES "info")
+  set(DUNE_MINIMAL_DEBUG_LEVEL 3)
+elseif(MINIMAL_DEBUG_LEVEL MATCHES "verb")
+  set(DUNE_MINIMAL_DEBUG_LEVEL 2)
+elseif(MINIMAL_DEBUG_LEVEL MATCHES "vverb")
+  set(DUNE_MINIMAL_DEBUG_LEVEL 1)
+else()
+  set(DUNE_MINIMAL_DEBUG_LEVEL 4)
+endif()
+endmacro(dune_set_minimal_debug_level)