Improving abbreviations/notations + backtrack of semantic change in r12439

- Deactivation of short names registration and printing for
  abbreviations to identical names, what avoids printing uselessly
  qualified names binding where the short name is in fact equivalent.
- New treatment of abbreviations to names: don't insert any maximally
  inserted implicit arguments at all at the time of the abbreviation
  and use the regular internalization strategy to have them inserted
  at use time.
- The previous modifications altogether make redirections of
  qualified names easier and avoid the semantic change of r12349 and
  hence allows to keep "Notation b := @a" as it was before, i.e.  as a
  notation for the deactivation of the implicit arguments of a.
- Took benefit of these changes and updated nil/cons/list/app
  redefinition in "List.v".
- Fixed parsing/printing notation bugs (loop on partially applied
  abreviations for constructors in constrintern.ml + bad reverting of
  notations with holes that captured non anonymous variables in
  match_cases_pattern).
- Add support for parsing/printing abbreviations to @-like constructors
  and for reverting printing for abbreviations to constructors applied
  to parameters only (function extern_symbol_pattern).
- Minor error messages fixes and minor APIs cleaning.

git-svn-id: svn+ssh://scm.gforge.inria.fr/svn/coq/trunk@12494 85f007b7-540e-0410-9357-904b9bb8a0f7

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