kes Complete hopefully the last of the copyright transfer changes.

kes  Separate NumVolumes in SD to NumReadVolumes and NumWrite volumes so
     that migration writing to multiple volumes doesn't mess up reading
     Volumes. This should fix bug #720 -- multivol migration fails.
kes  Make migration SQL look only for Type='B' jobs to migrate.  This should
     fix bug #724 jobs getting migrated twice.
kes  Convert remaining dev_cap(dev, ...) to use dev->has_cap().
kes  Implement dev->clear_cap() and dev->set_cap() methods.
kes  Turn off disk seeking on restore for DVDs since I am not 100%
     sure it works.