Hello,

I've just finished writing a little bit of code that allows the
scheduling of reviews. The basic idea is that every task that is
supposed to be reviewed has a LAST_REVIEW property (a date when the
task / project was last reviewed), and optionally a REVIEW_DELAY
property (with a configurable default value). If the current date is
after LAST_REVIEW + REVIEW_DELAY, then the task is considered up to
review.

I've written a small function to show these tasks in the agenda, and
a sorting function to allow them to be sorted from "this had to be
review so long ago" to "this has just been available to review". Another
function allows to set the LAST_REVIEW property to the current date (or
a chosen date if called with C-u).

I attach the code. It's the first time I'm contributing something like
this, so I don't really know how to do it. The header of the file is
basically the same one as from `contrib/org-expiry.el', and I tried to
keep a similar structure.

Please don't hesitate to comment & criticize the code, I'm still
learning my way around emacs-lisp and org-mode.

Thanks,

Alan