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saugns v0.4.4b. Turn PRNG seed into cli-settable variable.

Language changes:
 * Numerical expressions. Replace `seed(x)` with `$seed` magic
   variable, which composes with the non-overriding assignment
   feature for simple cli setting and script handling of seed.
   [Add backward-compatibility deprecated `seed(x)` function.]

Improve usage warnings on failed `$?name`, `$?name=...` check.

Old scripts can usually be updated with one of the below regex
options -- the 2nd will use `?=` assignment to allow override.

`perl -pi -e "s/\\/seed/\\\$seed=/g;" paths...`
`perl -pi -e "s/\\/seed/\\\$seed\\?=/g;" paths...`