[pstricks] Transparency issues with ghostscript

[Brandon Kuczenski]

Hi folks,
I am trying to keep up with changes to ghostscript surrounding the support
of transparency operations.  Brief recap: starting with GS 9.24, it was
necessary to turn off "safer" mode in the ps2pdf step in order to support
transparency because of security issues:
vulnerabilities:
https://bugs.chromium.org/p/project-zero/issues/detail?id=1640
workaround:
http://tex.stackexchange.com/questions/453780/pgfs-and-pstrickss-opacity-is-not-working/453786

Unfortunately, the Artifex team has now changed the transparency
implementation so that the ".setopacityalpha" and ".setshapealpha"
operators no longer work at all in 9.51 and 9.52. This means that upstream
code changes are required in order to continue to support transparency.

official notice:
https://ghostscript.com/pipermail/gs-devel/2020-May/010295.html
annoyed user's description (informative):
https://github.com/vectorgraphics/asymptote/issues/155#issuecomment-633202297

For me, this meant that the old "-dNOSAFER" workaround was no longer
effective. Allegedly they will introduce backward compatibility in 9.53? I
don't quite understand. Anyway, I have fixed the problem by downgrading to
gs 9.27 but I wanted to check my understanding, make sure this issue was
being tracked, and see whether there is a plan to fix it.

Many thanks,
Brandon
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