tools: make sure doctool anchors respect includes

Previously, output files which were created using includes (notably,
the single-page all.html) had basically broken internal links all
over the place because references like `errors.html#errors_class_error`
are being used, yet `id` attributes were generated that looked like
`all_class_error`.

This PR adds generation of comments from the include preprocessor
that indicate from which file the current markdown bits come and
lets the HTML output generation take advantage of that so that more
appropriate `id` attributes can be generated.

PR-URL: https://github.com/nodejs/node/pull/6943
Reviewed-By: Robert Jefe Lindstaedt <robert.lindstaedt@gmail.com>
Reviewed-By: Daniel Wang <wangyang0123@gmail.com>

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