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                                    CLASS CHRONO
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NEW CHRONO
    $o_chrono = new chrono([format default = "%01.3f"]);   
START CHRONO
    $o_chrono->start();         First time not needed - Constructor start chrono.
    
MARK MEMORY
    $o_chrono->mem(ID);         Put the time in Mem with id=ID.
LOOK LAP
    $o_chrono->lap();           Take time, chrono must be running, else error.
    $o_chrono->lap([ID]);       Take time from ID.
GET MEMORY
    $o_chrono->getmem();        Return number of marks in memory.
                                Push ID's in  $o_chrono->memkey array
                                Push lap's in $o_chrono->memlap array
                                (If $o_chrono->memlap[..] = ERR)
STOP CHRONO
    $o_chrono->stop();          Stop and Temporary stop (Pause - Start to continue).
                                Chrono must be running.
RESTART CHRONO
    $o_chrono->restart();       Start again from zero.
 
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