Make DBI a configure requirement

https://metacpan.org/pod/CPAN::Meta::Spec#Phases describes the phases
where the requirements are met. DBI is needed from the start to be
able to check and warn

Make the configuration pass even if the requirement is not (yet) met,
but add DBI to the front requirement of the toolchain too
Disable DBI::Test warning while that project is stalled
Allow release without DBD::File fix

DBD::File will have a fix for non-existing folders used in f_dir
but I do not want to stall DBD::File releases having to wait for
that fix in an upcoming DBI release. When DBI is updated *after*
DBD::CSV has been installed, the fix will have its intended impact
Release 0.45