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So we have a better chance of success if new warnings appear.

  (Now uses the Str module.)

- Lexer.check_producers_indices: New. Are $i keywords correctly used?

- yacc-parser/fancy-parser: Turn the type of actions' semantic values
  into arrows to delay the checking of $i keywords from lexing to
  parsing.

doc/main.tex: Precise that only unnamed semantic values can be referred using positional identifiers.

That would prevent us from verifying errors that are detected after
the front-end, such as epsilon-cycle.mly and no-tokens.mly.

These grammars are now accepted.

# Conflicts:
#	TODO

lowercase letter.

This module is now in src/.