Move (the children of) a subtree to another subtree programmatically

[Marcelo de Moraes Serpa <celoserpa@gmail.com>]

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Hi there,

I'm trying to figure out the best way to move the children of a subtree to
another one. The use-case is simple: I have another lisp function that
creates a new item in an orgfile for me everyday with the current date and
gives it focus. In the case below, it'd have created `<2018-01-01`> above
`<2017-12-31>`, that works already:

* <2018-01-01>
* <2017-12-31>
** TODO Foobar
** DONE Barfoo

As part of that, I'd also want to move all TODO items from the previous day
to the next day. I'm not sure how to do it though. I tried using
`org-map-entries` with an `if` to exclude the direct parent (the date item)
and then use `org-cut-subtree` and `org-paste-subtree` but for some reason
emacs hangs. I couldn't figure out how to use `org-refile` programmatically
though.

Considering I have access in elisp to both a `to` and `from` variables,
where `to` is `<2018-01-01>` and from is `<2017-12-31>` and that I want to
move all *non-DONE` items from `from` to `to`, how would I go about doing
that?

Thanks in adance!

- Marcelo.

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