Log message:
Import howm-1.3.9.1 as misc/howm from pkgsrc-wip-jp.
Based on PR#44553 by ISIHARA Takanori.

howm: Write fragmentarily and read collectively.

Howm is a note-taking tool on Emacs.  It is similar to emacs-wiki;
you can enjoy hyperlinks and full-text search easily. It is not
similar to emacs-wiki; it can be combined with any format.