For static builds we still need to manually reorder $HTTP_MODULES, and we
cannot source "auto/module" like the new-style configuration mode needs,
because the "auto/module" snippet modifies $HTTP_MODULES itself, but ignores
the new $ngx_module_order variable when doing a static build.
Fortunately, the old-style way of configuring the module is still working in
all Nginx versions for statically built modules, so we can keep using that
for static builds.
This fixes issue #46.
The fancyindex_footer and fancyindex_header settings need the standard Nginx
ngx_http_addition_module built into Nginx. Add a note to this effect in the
README.
Also, a warning is issued at configuration time if the addition module is not
enabled in the configuration.
Closes issue #26.