David Adam 21890ccac7 function: restore '%self' functionality for --on-process-exit ...

One key use of process expansion, used in currently-shipped code, is for running a function on
current shell exit.

Restore the use of %self as a valid argument (and add `self`) and document this change.

(faho: Remove bare "self")

2018-05-08 11:17:07 +02:00

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