fixed issue with wron attenuation set from file

added switch -rr for a certain numer of repetitions
of file reads

Signed-off-by: Stefan Venz <ikstream86@gmail.com>
added repetitive function with -rr for sine,ramp and triangle

Signed-off-by: Stefan Venz <ikstream86@gmail.com>
added two switches ms and us
To use mikroseconds as timeunit use the us switch
To use milliseconds as timeunit use the ms switch
If no time switch is used, the programm will use seconds as
standard time unit

Signed-off-by: Stefan Venz <ikstream86@gmail.com>