db: hash files by name, instead of keep two directory lists

TODO

@@ -16,9 +16,6 @@
 - Error handling and rollback
 - Dependency manipulation API: deletion, overwrite, check compatibility
 
-- Change fdb internally to has according to full filename (that's what we
-  use to lookup in install_archive_entry and also in info -W)
-
 - New user/group creation
 
 - Non-trivial solution finder

src/apk_database.h

@@ -20,7 +20,7 @@
 #define APK_MAX_REPOS 32
 
 struct apk_db_file {
-	struct hlist_node dir_files_list;
+	struct hlist_node hash_node;
 	struct hlist_node diri_files_list;
 
 	struct apk_db_dir_instance *diri;
@@ -79,6 +79,7 @@ struct apk_database {
 	struct {
 		struct list_head packages;
 		struct apk_hash dirs;
+		struct apk_hash files;
 		struct {
 			unsigned files;
 			unsigned dirs;