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...`