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/main.c

@@ -96,7 +96,7 @@ main(int argc, char **argv)
 	if (argc < 1)
 		usage();
 
-	if ((rv = xbps_prepare_repolist_data()) != 0) {
+	if ((rv = xbps_repository_pool_init()) != 0) {
 		if (rv != ENOENT) {
 			printf("E: cannot get repository list pool! %s\n",
 			    strerror(rv));
@@ -202,6 +202,6 @@ main(int argc, char **argv)
 	}
 
 out:
-	xbps_release_repolist_data();
+	xbps_repository_pool_release();
 	exit(rv ? EXIT_FAILURE : EXIT_SUCCESS);
 }