biblio: Implemented the `name+year' label style.

* src/guile/skribilo/biblio.scm: Use `biblio author'.
  (assign-entries-numbers!): New (formerly `count!' in `resolve-the-bib').
  (assign-entries-name+years!): New.
  (resolve-the-bib): New optional `assign-entries-identifiers!' argument.
  Use it.

* src/guile/skribilo/biblio/author.scm (short-author-names): New.

* src/guile/skribilo/engine/lout.scm (lout-bib-refs-sort/number): Accept
  non-number identifiers.
  (&the-bibliography): Use simply `@TaggedList' when a style other than
  `number' is used.
  (&bib-entry): Use `@DropTagItem' when the bibliography style is not
  `number'.

* src/guile/skribilo/package/base.scm (the-bibliography): New `:labels'
  option.  Pass the right label assignment function to `resolve-the-bib'.

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Files to commit:
   src/guile/skribilo/package/base.scm
   src/guile/skribilo/engine/lout.scm
   src/guile/skribilo/biblio.scm
   doc/user/bib.skb
   src/guile/skribilo/biblio/author.scm

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git-archimport-id: skribilo@sv.gnu.org--2006/skribilo--devo--1.2--patch-92

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