Proposal to fix SYS:RUN-PROGRAM for JVM[56]

[Mark Evenson]

>From <http://abcl.org/trac/ticket/422#comment:4>:

After further analysis, the new plan of attack:

1.    Continue to deprecate SYS:RUN-SHELL-COMMAND, as the JVM-[56]
actually seem to provide all the behavior we need.

2.    Fully support the current signature of the abcl-1.5.0-dev
SYS:RUN-PROGRAM as extended by Pipping and Olof. The environment
clearing/setting will work without alterations. "All that is needed" is
to create an org.abcl.util.AsyncIOManager using the non-blocking file
descriptor framework in java.jnio (introduced in JVM5) to drain/fill
input/output org.armedbear.lisp.Stream instances. Pipping has collected
a thorough test suite for the SYS:RUN-PROGRAM behavior, which will be of
great use in implementation.

The use of SYS:RUN-PROGRAM as invoked by UIOP/RUN-PROGRAM as the
implementation interface should mean that ASDF should "just work" when
the new code passes Pipping's test suite.

TODO: transcribe details of SYS:RUN-PROGAM test suite invocation;
implement ASyncIOManager.

Such work is intended for an abcl-1.4.1 release by the end of November 2016.

-- 
"A screaming comes across the sky.  It has happened before, but there
is nothing to compare to it now."