- create symlink 'dune' if it is possible: tests can run with consistent

  include-path even when toplevel-directory is not called 'dune'. On
  platforms/filesystems not supporting symlinks the name of the
  current directory is checked and an appropriate include-path is set
- add two test-related Makefiles

[[Imported from SVN: r82]]

configure.ac

@@ -21,9 +21,50 @@ AC_CHECK_PROGS([BIBTEX], [bibtex], [true])
 AC_CHECK_PROGS([DVIPDF], [dvipdf], [true])
 AC_CHECK_PROGS([DVIPS], [dvips], [true])
 
+# create symlink for consistent paths even when $(top_srcdir) is not
+# called dune/ (if filesystem/OS supports symlinks)
+AC_PROG_LN_S
+if test x"$LN_S" == x"ln -s" ; then
+  # Symlinks possible!
+
+  # does a file already exist?
+  if test -e dune ; then
+    # exists: is a symlink?
+    if test -L dune ; then
+      if test -e dune/grid/common/grid.hh ; then
+        # suppose that the link is ok and use it
+        AM_CPPFLAGS='-I$(top_srcdir)';
+      else
+        AC_MSG_ERROR([Symlink 'dune' exists but appears to be wrong! Please remove it manually])
+      fi
+    fi
+  else
+    echo Creating dune-symlink...
+    # set symlink
+    ln -s . dune ;
+    # set proper include-path
+    AM_CPPFLAGS='-I$(top_srcdir)';
+  fi
+else
+  # no symlinks possible... check name of directory
+
+  # does dune-dir above exist and is it this directory?
+  if test -d ../dune && test `pwd` == `( cd ../dune && pwd)` ; then
+    DIR=`(cd .. && pwd)`;
+    # use directory above current dir in include-path
+    AM_CPPFLAGS="-I$DIR";
+  else
+    AC_MSG_ERROR([No symlinks supported! You have to rename the current directory to the name 'dune'])
+  fi
+fi
+
+# preset variable to path such that #include <dune/...> works
+AC_SUBST(AM_CPPFLAGS)
+
 # write output
 AC_CONFIG_FILES([Makefile
 	         common/Makefile
+		 common/test/Makefile
                  fem/Makefile
                  fem/common/Makefile
                  fem/discfuncarray/Makefile
@@ -37,6 +78,7 @@ AC_CONFIG_FILES([Makefile
 		 istl/doc/Makefile
 		 istl/tutorial/Makefile
                  lib/Makefile
+		 lib/test/Makefile
                  operator/Makefile
 	         quadrature/Makefile
 	         quadrature/common/Makefile