Fix for #80: fallback only shown when the template to include wasn't found. In addition, the nesting of includes and fallback content should work correctly, and directives/expressions/etc inside fallback content are processed. Thanks to Christian Boos for the original patch and unit tests.

exclude doc/2000ft.graffle
exclude doc/docutils.conf
recursive-exclude doc/logo.lineform *
exclude doc/Makefile
include doc/*.html