1.13.1.65 Random number generator
The behavior of the built-in function `rand(x)` has changed as of version 3.8l.
Older scripts that expected rand(x>0) to produce sequential pseudo-random
numbers from the same seeded sequence must be changed to call rand(0) instead.
The current behavior is as follows:
| | `rand(0)` returns a pseudo random number in the interval [0:1] generated
from the current value of two internal 32-bit seeds.
`rand(-1)` resets both seeds to a standard value.
`rand(x)` for x>0 sets both seeds to a value based on the value of x.
`rand({x,y})` for x>0 sets seed1 to x and seed2 to y.
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