Implemented per-document node identifiers.

* src/guile/skribilo/ast.scm: Autoload `srfi-1' on `fold'.
  (*node-table*): Removed.
  (bind-markup!): Removed.
  (initialize<markup>): Removed.
  (find-markups): Removed.
  (write<markup>): Commented out debugging `format'.
  (<document>)[node-table]: New slot.
  [nodes-bound?]: New slot.
  (document-lookup-node): New.
  (document-bind-node!): New.
  (document-bind-nodes!): New.
  (ast-fold): New.
  (find-markup-ident): Removed.

* src/guile/skribilo/output.scm (*document-being-output*): New.
  (out<document>): New.

* src/guile/skribilo/resolve.scm (*document-being-resolved*): New.
  (resolve!): Invoke `document-bind-nodes!' before resolving the
  document.
  (do-resolve!<document>): Parameterize `*document-being-resolved*'.
  (resolve-ident): Use `document-lookup-node' instead of `find-markups'.

* src/guile/skribilo/utils/compat.scm (bind-markup!): New.
  (find-markups): New.
  (find-markup-ident): New.

git-archimport-id: lcourtes@laas.fr--2005-libre/skribilo--devo--1.2--patch-57

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