- fix provides

- -branding-upstream should supplement exo-data
- replace %lang_package by a manually specfified -lang package
- %{libname} should recommend -lang since there are translations
for the library
- drop rpmlintrc

- split exo into libexo-1-0, exo-tools, and exo-data in order to
conform to the shared library packaging policy
- added exo-icons.tar.bz2 with icons from tango-icon-theme 0.8.90
in order to provide icons for all desktop files and to prevent a
dependency on an icon theme
- specfile cleanup
- added exo-fix-python-install-location.patch in order to install
all python files under %%{python_sitearch}
- dropped exo-env.patch, shebang lines are fixed during build
instead