Add inf-scheme to org babel

[nikolavojicic]

https://orgmode.org/worg/org-contrib/babel/languages/index.html

It should use Scheme like run-scheme.

[nikolavojicic]

• Start with instrumenting see edebug the org-babel-execute:template function, and subsequently evaluate some test-code block. In this way you can easily figure out how Babel processes header arguments. Then in the end, the result printed by a code block simply consists of the output of that function.
• The trick is to process the vars, result-params, and the full-body variable (let form within org-babel-execute:template function) and send the appropriate lines to some inferior process (or as an argument to some shell command). The inferior process can be created in the function org-babel-template-initiate-session. The result returned by the inferior process (or by the shell command), should be returned by org-babel-execute:template (of course you might further process it before you return it).
• Don't forget to read the comments in the ob-template file, e.g. for sending/receiving output to/from an inferior process. The functions in org-babel-comint might also be useful.

[nikolavojicic]

3. In function org-babel-expand-body:template we assume that vars is a list of pairs. However, it seems to me from some experiments that sometimes vars contains symbols. Am I wrong?

:var elements in params should always have the following form.

(:var name . value)

Their cdr should always be a cons cell whose car is the name of the variable "as a symbol" and whose value is the value of the variable.

[nikolavojicic]

;; If you are planning on adding a language to org-babel we would ask ;; that if possible you fill out the FSF copyright assignment form ;; available at https://orgmode.org/request-assign-future.txt as this ;; will make it possible to include your language support in the core ;; of Org-mode, otherwise unassigned language support files can still ;; be included in the contrib/ directory of the Org-mode repository.