recfiles comments format

Latest 0.9.x release changes its format of comments storage. Instead of
concatenated text only netstrings, it uses GNU recutils'es recfile
format, that is record and field based out of box and can be easily
processed with external utilities.

comment 0:

From: Sergey Matveev
Date: 2020-10-15 16:36:07Z

Yep, yet another
multilined comment.