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

lib/util.c

@@ -128,7 +128,7 @@ int SYMEXPORT
 xbps_check_is_installed_pkg(const char *pkg)
 {
 	prop_dictionary_t dict;
-	const char *instpkgver;
+	const char *instpkgver = NULL;
 	char *pkgname;
 	int rv = 0;
 	pkg_state_t state = 0;
@@ -142,14 +142,18 @@ xbps_check_is_installed_pkg(const char *pkg)
 	dict = xbps_find_pkg_installed_from_plist(pkgname);
 	if (dict == NULL) {
 		free(pkgname);
-		return 0; /* not installed */
+		if (errno == ENOENT) {
+			errno = 0;
+			return 0; /* not installed */
+		}	
+		return -1;
 	}
 
 	/*
 	 * Check that package state is fully installed, not
 	 * unpacked or something else.
 	 */
-	if (xbps_get_pkg_state_installed(pkgname, &state) != 0) {
+	if (xbps_get_pkg_state_dictionary(dict, &state) != 0) {
 		prop_object_release(dict);
 		free(pkgname);
 		return -1;