Merge with group-commit.

clients/Tests/exports.stable.out

@@ -543,9 +543,9 @@ gdk_return log_bat_transient(logger *lg, log_id id);
 gdk_return log_constant(logger *lg, int type, ptr val, log_id id, lng offset, lng cnt);
 gdk_return log_delta(logger *lg, BAT *uid, BAT *uval, log_id id);
 gdk_return log_sequence(logger *lg, int seq, lng id);
-gdk_return log_tdone(logger *lg, ulng commit_ts);
 gdk_return log_tend(logger *lg);
-gdk_return log_tstart(logger *lg, bool flush);
+gdk_return log_tflush(logger *lg, ulng log_file_id, ulng commit_ts);
+gdk_return log_tstart(logger *lg, bool flushnow, ulng *log_file_id);
 gdk_return logger_activate(logger *lg);
 lng logger_changes(logger *lg);
 logger *logger_create(int debug, const char *fn, const char *logdir, int version, preversionfix_fptr prefuncp, postversionfix_fptr postfuncp, void *funcdata);