Merge feat/p2-itemize-output: structured change output (-i, --list-only, --out-format, --log-file-format)

Client-only per-file event/format model (change_list.c). Reviewed
(c-review APPROVE WITH NITS, all fixed); PR #263.

src/shared/config.c

@@ -74,6 +74,7 @@ static void config_set_defaults(Config* config) {
   config->preserve_sparse = false;
   config->itemize_changes = false;
   config->out_format = NULL;
+  config->log_file_format = NULL;
   config->info_level = 0;
   config->debug_level = 0;
   config->list_only = false;
@@ -224,6 +225,7 @@ void config_delete(Config* config) {
   free(config->backup_dir);
   free(config->server_host);
   free(config->out_format);
+  free(config->log_file_format);
   free(config->files_from);
   free(config->rsh_command);
   free(config->rsync_path);