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-repo/repository.c

@@ -207,7 +207,10 @@ show_pkg_info_from_repolist(const char *pkgname)
 		repo_pkgd = xbps_find_pkg_in_dict(rd->rd_repod,
 		    "packages", pkgname);
 		if (repo_pkgd == NULL) {
-			errno = ENOENT;
+			if (errno && errno != ENOENT) {
+				rv = errno;
+				break;
+			}
 			continue;
 		}
 		url = xbps_get_path_from_pkg_dict_repo(repo_pkgd, rd->rd_uri);
@@ -243,7 +246,10 @@ show_pkg_deps_from_repolist(const char *pkgname)
 	SIMPLEQ_FOREACH(rd, &repodata_queue, chain) {
 		pkgd = xbps_find_pkg_in_dict(rd->rd_repod, "packages", pkgname);
 		if (pkgd == NULL) {
-			errno = ENOENT;
+			if (errno != ENOENT) {
+				rv = errno;
+				break;
+			}
 			continue;
 		}
 		if (!prop_dictionary_get_cstring_nocopy(pkgd,