New Lagged Fib. PRNG gen and random2.d

[Joseph Rushton Wakeling]

On 26/08/13 17:26, monarch_dodra wrote:
> One more thing. One of the ways I see it (specifically for LF): We can add
> auto-seed later if we decide it was a bad idea to not have it. The opposite
> isn't possible.

One note on seeding.  As it stands, some RNGs do have a valid default 
configuration _without_ seed() being called -- see e.g. Xorshift.