Bug fix:
========
Ignore broken signatures,
reject email address ending in \,
fix another null pointer,
respect return codes after signals,
install zdkimgenkey in .spec.


Changes:
========
Add include and override features to config,
same owner/permission as zdkimsign for redact,
default RSA key length to 2048 for new keys,
pick mime-wrapped Content-Type: in recovery.
