Async processes to be persistent even after exiting Emacs

[Boruch Baum]

The standard built-in method that Emacs uses to spawn an asynchronous
processes doesn't enable those processes to survive the killing of their
process buffers, and certainly not to survive exiting emacs.

I've posted[1] a commit demonstrating a flexible method to optionally
circumvent those limitations. My use-case is my desire to be able to use
dired to open a file in an operating system's default external program
(ala xdg-open), and have that process persist even after exiting Emacs.


[1] 
https://github.com/Boruch-Baum/emacs-diredc/commit/a46b61817610e4ad3824b5a87393217f1b3cdd2c

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