outline: Don't store multiple values in a single variable.

Don't store multiple-value results in a single variable as it may
behave in unspecified ways (see
http://thread.gmane.org/gmane.lisp.guile.devel/8289).

* src/guile/skribilo/reader/outline.scm (apply-any): New VALUE-COUNT
  argument.  Properly handle multiple values, e.g., by not comparing
  multiple-value returns against `#f'.
  (make-line-processor, make-node-processor, make-document-processor):
  Safely assume `apply-any' always returns the right number of
  values.

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