v2.2.1

This is a small patch.

There are two bugfixes for setcol-fill (see #884), and a typo fix in the manpage.

Additionally, there is now a packaged visidata.1, so that man visidata will also bring up the VisiData manpage, when the manpage is successfully installed.

VisiData v2.2 has been packaged for Debian, and is slated to be part of the bullseye distribution. I am hoping I can sneak v2.2.1 in there, also.

Happy data-sleuthing!