Crash test update

[Caolán McNamara]

On Fri, 2020-09-04 at 04:23 +0000, crashtest wrote:
> New crashtest update available at 
> https://dev-builds.libreoffice.org/crashtest/12a7a3d57d3dcf222b13fa9143c37736f8ea3d0b/

There is one import crasher that turns up fairly consistently that
looks like a possible threaded calculation problem

bt:
https://dev-builds.libreoffice.org/crashtest/12a7a3d57d3dcf222b13fa9143c37736f8ea3d0b/backtraces/task565-core.backtrace.txt

source document:
https://bugs.documentfoundation.org/attachment.cgi?id=51878

On manually opening it I can't reproduce locally, but there is a
warning that "the maximum number of columns per sheet was exceeded"