Keywords-as-hash final (I hope) version

Here is what I hope to be the final version of the actual API change portion
of the keywords-as-hash patch.

I would appreciate any reviews, especially regarding whether there are any
missing "const"s in the new APIs.

I have removed the implemetation of a $UUID$ keyword from this patch,
because it is an unrelated feature, and I don't recall any discussion on
whether $UUID$ was a suitable keyword name. Might other things apart from
repositories have UUIDs one day?

Max.

[[[
Revise keywords API - represent keywords as a hash for better extensibility.
Implement internal printf-like format characters for keyword expansion.
A part of issue #890. Note that this only introduces the new APIs - making
the rest of the code make use of them will be a separate commit.
Based on a patch by John Peacock <jpeacock@rowman.com>.

* subversion/includes/svn_subst.h:
   (svn_subst_keywords_t): Deprecated.
   (svn_subst_build_keywords2): Interface change; hash instead of struct.
   (svn_subst_build_keywords): Deprecated.
   (svn_subst_keywords_differ2): Interface change.
     A new argument apr_pool_t *pool and use hash instead of struct.
   (svn_subst_keywords_differ): Deprecated.
   (svn_subst_translate_stream2): Interface change; hash instead of struct.
   (svn_subst_translate_stream): Deprecated.
   (svn_subst_copy_and_translate3): Interface change; hash instead of
struct.
   (svn_subst_copy_and_translate2): Deprecated.
   (svn_subst_translate_cstring2): Interface change; hash instead of struct.
   (svn_subst_translate_cstring): Deprecated.

* subversion/includes/svn_types.h: (SVN_KEYWORD_REVISION_FORMAT,
   (SVN_KEYWORD_DATE_FORMAT, SVN_KEYWORD_AUTHOR_FORMAT)
   (SVN_KEYWORD_URL_FORMAT, SVN_KEYWORD_ID_FORMAT):
     New defines - format strings for keyword expansion.

* subversion/libsvn_subr/svn_subst.c:
   (keyword_printf): New private function;
     printf-style formatting of keywords based on format strings.
   (kwstruct_to_kwhash): New private function;
     convert keywords struct into keywords hash.
   (svn_subst_build_keywords): Convert to API compatibility wrapper.
   (svn_subst_build_keywords2): Build keywords using keyword_printf().
   (translate_keyword): Interface changes. Also, look up the keyword in the
     passed in buffer, instead of trying to translate all possibilities.
   (svn_subst_keywords_differ): Retain unchanged for API compatibility.
   (svn_subst_keywords_differ2): New function;
     compare two hashes instead of comparing individual structure elements.
   (svn_subst_translate_stream): Convert to API compatibility wrapper.
   (svn_subst_translate_stream2): Change interface only.
   (svn_subst_translate_cstring): Convert to API compatibility wrapper.
   (svn_subst_translate_cstring2): Update function call to new API version.
   (svn_subst_copy_and_translate2): Convert to API combatibility wrapper.
   (svn_subst_copy_and_translate3): Update function call to new API version.
   (svn_subst_translate_string): Update function call to new API version.
   (svn_subst_detranslate_string): Update function call to new API version.
]]]

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