Silence nonessential test warning (last outstanding \o/)
Move classdata handling to DBICTest::Util::LeakTracer
Make the dbh error handler installer `Perl -d` friendly

GC in perl is a mess sometimes - a literal sub { ... } within a try { ... } goes
wonky, but the equivalent coderef stored in a scalar is fine >.<
Pod/comment fixes
MULTICREATE_DEBUG + TRACE_PROFILE=console_monochrome results in >4MB log