These archives are large and are not included in the source tarball and
so not in the pcp-testsuite package.

They can be used by QA tests run from a git tree provided they have
appropriate _notrun guards.

The archives fall into 2 classes.

1. Big archives that are used to make smaller subset archives (with
   pmlogextract or pmlogreduce or truncate) for QA tests.

2. Big archives that are used in tests that are only of interest to
   developers working in a git tree.
