Major changes in libxbps to implement caching in some cases.

libxbps:
 - Moved repolist code to lib/repository_pool.c.
 - Renamed xbps_{prepare,release}_repolist_data() to
   xbps_repository_pool_{init,release} respectively.
 - Moved regpkgdb dict code to lib/regpkgs_dictionary.c.
 - Renamed xbps_{prepare,release}_regpkgdb_dict() to
   xbps_regpkgs_dictionary_{init,release} respectively.
 - Use a global reference count for repository_pool and regpkgs_dictionary,
   this gives a substantial performance gain while looking for dependencies
   in repository pool, among other things.
 - Make xbps_find_pkg_* functions return errno and use it to detect
   for spurious errors in code using them.
 - Add code to detect when a dependency is already unpacked.

xbps-bin:
 - Do not set pkg state to unpacked in the transaction, it's set already
   while a package is unpacked.
 - While installing or updating packages, it now knows when a dependency
   is already unpacked and shows it as "unconfigured".

Bump XBPS_RELVER to 20091126.

--HG--
extra : convert_revision : xtraeme%40gmail.com-20091126022250-uu8x0fa86l4scb5x

bin/xbps-bin/show-deps.c

@@ -69,8 +69,6 @@ xbps_show_pkg_deps(const char *pkgname)
 	prop_object_release(propsd);
 	prop_object_release(pkgd);
 
-	xbps_release_regpkgdb_dict();
-
 	return rv;
 }
 
@@ -89,7 +87,6 @@ xbps_show_pkg_reverse_deps(const char *pkgname)
 	rv = xbps_callback_array_iter_in_dict(pkgd, "requiredby",
 	    list_strings_sep_in_array, NULL);
 	prop_object_release(pkgd);
-	xbps_release_regpkgdb_dict();
 
 	return rv;
 }