* configure.in: added gegl/operation/Makefile to the list of files to
        create.
        * gegl/Makefile.am: added subdir.
        * gegl/operation/Makefile.am: new makefile.
        * gegl/gegl-operation*.[ch]: moved to a operation subdir.

        A lot of other files just had the path of some #includes modified.

svn path=/trunk/; revision=1537