[PD] [random] and seed value

[Thomas Mayer]

Hello,

currently [random] uses a fixed value for initialisation. This leads to 
the same sequence of values all the time.

https://github.com/pure-data/pure-data/blob/c0cd34924a50bdd1cc37dfb6b01f9be02ad8a78b/src/x_misc.c#L55

My guess is, that most users probably expect at least different seed 
values every time.

Maybe the help file should explicitely state the behaviour or a 
different way for deriving the initial seed should be used, e.g. taking 
the local time. Or a better PRNG could be used as well.

If we take the solution to initialize [random] with a different seed 
each time, an explanation on how to revert to the old behaviour of a 
seed value of 1489853723 should be mentioned in the help.

I could tackle that, but would like a discussion about that before coding.

Thanks,
Thomas
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