Hello,

This updates our mcron2 packages (used by default in our mcron service)
to Guile 2.2, so that we can use new goodies in our job scripts.

Here's an example that didn't work before with Guile 2.0, because its
http-get method lacked HTTPS support:

--8<---------------cut here---------------start------------->8---
(define duckdns-job
  ;; Update personal domain IP every 5 minutes.
  #~(job '(next-minute (range 0 60 5))
	 (lambda ()
	   (use-modules (web client))
	   (http-get
	    (string-append
	     "https://www.duckdns.org/update?domains=apteryx&token="
	     #$sec-dyndns-token "&ip=")))))
--8<---------------cut here---------------end--------------->8---

I've also fixed the manual page which was failing to be generated for mcron2.

Thank you,

Maxim