bug fix release 0.22.1

[Mark Walters]

>> A long time ago, David E. fixed a couple of annoying bugs with the emacs
>> interface, and I added two commits to the release branch with the intent
>> of making a bugfix point release. Then I got distracted, and never made
>> that release.  Are there any other small, but important fixes in master
>> that I should cherrypick? A few candidates are listed below.

>> Mark Walters:
>>       emacs: show: improve handling of mark read tagging errors
>>       - not sure if this really fits the small bugfix category.
>
> I'd say nil -- I have something to check on this ... (*)

I think this can wait -- the error is "local" to the particular show
buffer (in particular reloading the buffer will fix it).

Best wishes

Mark