Patch for glade/libglade

[Hans Nieuwenhuis <vzzbx xs4all nl>]

Hello all,

Attached is a series of patches that adds support for GtkDatabox and
GtkDataboxRuler in glade-3 and libglade.

The patch does the following:
- Builds a runtime module for libglade that lets you add the above
mentioned widgets to your .glade file (libglade).
- Builds a module and catalog file that adds both widgets to the widgets
palette in glade-3.
- It adds the --enable-libglade and --enable-glade switches to configure.

The patch applies cleanly against gtkdatabox 0.8.0.1 and 0.8.0.2. It was
tested with libglade 2.6.2 and glade-3 3.4.0.

Enjoy!

Hans 

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