Read only of REPL prompt in Inf-Haskell

[m00nlight]

It should be nice to make the repl prompt in Inf-haskell buffer not deletable like in the eshell mode.

[gracjan]

@m00nlight: you see to know what you want and know how to copy paste relevant fragment from eshell. How about a pull request?

[m00nlight]

@gracjan OK. I will try to patch a pull request.

[gracjan]

@m00nlight: great!

[m00nlight]

@gracjan After some investigation, I found that inf-haskell-mode is depreciated. It is replaced by interactive-haskell-mode which can configured with the following link:

https://github.com/haskell/haskell-mode/wiki/Haskell-Interactive-Mode-Setup

And the prompt of interactive-haskell-mode is read-only by default. So do we still need to patch
the depreciated inf-haskell-mode? Or should we just to update the configure tutorial on haskell wiki
and make more clear document in the repository?

[1] https://wiki.haskell.org/Emacs
[2] https://wiki.haskell.org/Emacs/Inferior_Haskell_processes

[gracjan]

@m00nlight: updates to instructions are way more important than fixing old code. Can you do that?

[m00nlight]

@gracjan OK. No problem. I will update the configuration tutorial.