** Added support for <<mainloop:signal,synchronous delivery of signals>>.
** Added relative timers: <<mainloop:fun_timer_add_rel,`timer_add_rel()`>>.
** Modification of events from a running event handler should be always safe.
** Added support for <<mainloop:signal,synchronous delivery of signals>>.
** Added relative timers: <<mainloop:fun_timer_add_rel,`timer_add_rel()`>>.
** Modification of events from a running event handler should be always safe.