some changes to eir-eval-in-repl-python and creation of eir-eval-in-perl about eval-in-repl HOT 4 OPEN

Hi! I will send up a PR after we get back from camping in a couple weeks. There are still some shenanigans I need to clear up: notably when I am working in a multi-mode markdown file, sometimes my code sends the ``` along with the code block to the repl. I had this problem in ess a long time ago, so I just need to poke until I remember why.

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These sound very useful! I have been essentially accepting all pull requests into this repo.

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I don't currently do it or require others to do it, but I guess we should really test these things via a testing suite. I used to think it's impossible to test a very interactive package. But I'm learning elsewhere buttercup.el and with-temp-buffer can be used to examine user-facing behaviors (https://github.com/kaz-yos/stan-mode/blob/new-features/stan-mode/test-stan-mode.el). This isn't quite the interactive part, but it should be theoretically possible to emulate and test every keystroke since they are all command executions.

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I just read over test-stan-mode.el, I did not fully understand what was going on, but it looks like the most awesome thing ever for working through getting these behaviors correct. Thank you for the heads up!

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