Collect all processes in an Eshell pipeline, not just the head and tail

This has the extra benefit that Eshell now only considers a pipeline
to be done when *all* of its processes are done (previously, it
checked only the last one in the pipeline).

* lisp/eshell/esh-util.el (eshell-process-pair-p)
(eshell-make-process-pair): Rename to...
(eshell-process-list-p, eshell-make-process-list): ... these, and
handle lists of processes.  Update callers.

* lisp/eshell/esh-cmd.el (eshell-head-process): Use 'car'.
(eshell-tail-process): Get the last element of the list.
(eshell-do-pipelines): Return a list of all processes in the pipeline.
(eshell-do-pipelines-synchronously): Return the result of the first
command (usually t or nil).
(eshell-execute-pipeline): Simplify.
(eshell-do-eval): Pass all processes to 'eshell/wait'.

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