Set buffer local comint-input-sender-no-newline

[arichiardi]

Now that the sanitation code appends a final newline to the command we need to
tell comint not to add one.

Together with #137, it should
bring things back to normal and definitely more correct.

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[arichiardi]

So for posterity, this solution does not actually work.

Because of process-send-eof called at the end of comint-simple-send, which I have no idea of what is intended to achieve, an error is throw saying that there is no process associated with the buffer we execute in, which is a source buffer (only *inf-clojure* has a process associated with it).

So either we set a process for our source files, losing the flexibility of having many *inf-clojure* per source file, or we use something else for sending commands.

A super low-level comint-send-string is used there and I am going to try that one in another PR.