To improve development, I would like to see bug reports
accompanied by new tests in PDL/t as much as possible.
However, that results in failed builds by default until the
bugs are fixed.
I propose an option (environment variable and/or command
line flag) that would skip tests corresponding to ones in the
Known_problems list. That would allow the default to be
testing for the problems but enable easy full builds and
installs of development versions without manual intervention.