[PATCH] Improve geiser-repl-autoeval-mode behavior

[Antero Mejr]

This patch makes 3 improvements to geiser-repl-autoeval-mode:

- Don't autoeval lines that have already been evaluated.
- Don't keep highlighting parens after the line is auto-evaluated.
- Don't highlight if show-paren-mode is not enabled.

It also removes the text indicating that the mode could cause issues
with paredit, as I've used it with paredit and electric-pair-mode and it
seems to work OK.

0001-Improve-geiser-repl-autoeval-mode-behavior.patch
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