Added some subheadings.

git-svn-id: https://svn.hexagonit.fi/hexagonit.recipe.cmmi/trunk@4537 b96f28ea-bbdf-0310-b3b3-e15a02b9f88d

hexagonit/recipe/cmmi/README.txt

@@ -127,6 +127,10 @@ default build options.
 As we can see the configure script was called with the ``--prefix``
 option by default followed by calls to ``make`` and ``make install``.
 
+
+Advanced configuration
+======================
+
 The above options are enough to build most packages. However, in some
 cases it is not enough and we need to control the build process
 more. Let's try again with a new buildout and provide more options.
@@ -170,6 +174,10 @@ targets and also patches the source code before the scripts are run.
     installing patched package
     installing patched package-lib
 
+
+Customizing the build process
+=============================
+
 Sometimes even the above is not enough and you need to be able to
 control the process in even more detail. One such use case would be to
 perform dynamic substitutions on the source code (possible based on