[m-rev.] for review: enable Java and C# grades by default

[Julien Fischer]

For review by anyone.

The increase in installation time is relatively slight here -- 
installation of the libraries in non-C grades is quicker than in C.

----------

Enable the Java and C# grades by default.

configure.ac:
 	As above.  Also rename --enable-{java,csharp}-grade to
 	--disable-{java,csharp}-grade.

.INSTALL.in:
 	Conform to the above change.

Julien.

diff --git a/.INSTALL.in b/.INSTALL.in
index 51aad36..db62cf1 100755
--- a/.INSTALL.in
+++ b/.INSTALL.in
@@ -159,8 +159,13 @@ make install
  #          of the .NET grades (see README.DotNet).  This grades are only
  #          installed if the .NET SDK is found.
  #
-#          The option --enable-java-grade causes the installation of the Java
-#          grade.  This grade is only installed if the Java SDK is found.
+#          The option --disable-java-grade prevents the installation of the
+#          Java grade.  The Java grade will be installed by default if the
+#          Java SDK is found.
+#
+#          The option --disable-csharp-grade prevents the installation of the
+#          C# grade.  The C# grade will be installed by default if the
+#          .NET SDK is found.
  #
  #          The option --enable-erlang-grade causes the installation of the
  #          Erlang grade.  This grade is only installed if the Erlang/OTP
diff --git a/configure.ac b/configure.ac
index b0c8183..969737c 100644
--- a/configure.ac
+++ b/configure.ac
@@ -3550,15 +3550,13 @@ AC_ARG_ENABLE(dotnet-grades,
      AC_HELP_STRING([--enable-dotnet-grades], [install the .NET grades]),
      enable_dotnet_grades="$enableval",enable_dotnet_grades=no)

-# We don't enable the csharp grade by default.
  AC_ARG_ENABLE(csharp-grade,
-   AC_HELP_STRING([--enable-csharp-grade], [install the C# grade]),
-   enable_csharp_grade="$enableval",enable_csharp_grade=no)
+   AC_HELP_STRING([--disable-csharp-grade], [do not install the C# grade]),
+   enable_csharp_grade="$enableval",enable_csharp_grade=yes)

-# We don't enable the java grade by default.
  AC_ARG_ENABLE(java-grade,
-   AC_HELP_STRING([--enable-java-grade], [install the Java grade]),
-   enable_java_grade="$enableval",enable_java_grade=no)
+   AC_HELP_STRING([--disable-java-grade], [do not install the Java grade]),
+   enable_java_grade="$enableval",enable_java_grade=yes)

  # We don't enable the Erlang grades by default because it is still
  # experimental.