Port features from the previous prolog.el to the new one.

* lisp/progmodes/prolog.el (prolog-system): Add GNU and ECLiPSe options.
(prolog-program-name, prolog-program-switches, prolog-consult-string)
(prolog-compile-string, prolog-prompt-regexp): Get rid of the <foo>-i
variable and use a function to compute the value dynamically.
(prolog-prompt-regexp): Add regexp for GNU Prolog.
(prolog-continued-prompt-regexp): Remove, unused.
(prolog-find-value-by-system): Try and use the value of prolog-system
in the *prolog* buffer if it helps.
(prolog-mode-keybindings-common): Bind C-c C-z unconditionally...
(prolog-zip-on): ..and check prolog-system and version here instead.
(prolog-inferior-self-insert-command): New command.
(prolog-inferior-mode-map): Use it.
(prolog-inferior-error-regexp-alist): New var.
(prolog-inferior-mode): Use it, along with compilation-shell-minor-mode.
(prolog-input-filter): Use derived-mode-p.
(prolog-inferior-guess-flavor): New function.
(prolog-ensure-process): Use it.  Use make-comint-in-buffer rather than
make-comint to avoid running comint-mode twice.
(prolog-inferior-buffer): New fun.
(prolog-old-process-region, prolog-old-process-file):
Don't call prolog-bsts here...
(prolog-build-prolog-command): ...do it here instead.
(prolog-old-process-region, prolog-old-process-file):
Use compilation-fake-loc and compilation-forget-errors.
(prolog-consult-compile-region): Use bolp.

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