Update to version 8

• Make a "make coverity" rule to scan the source
  Results at: https://scan.coverity.com/projects/rhboot-dbxtool
• Don't try to apply anything if PK and KEK aren't enrolled
• Add --force and --quiet for the PK/KEK checker, and use them in the
  systemd service.
• Add a .syntastic_c_config for vim's Syntastic modules
• Use tsearch()/tfind()/tdestroy() from libc instead of ccan htables
• Don't open the dbx file with O_RDWR|O_CREAT, use O_RDONLY.
• Lots of minor bug fixes gcc -Wextra and friends found.

dbxtool 7

• Fix creating new dbx vs appending to an old one.
• Update dbx for CVE-2016-3320 and https://support.microsoft.com/en-us/kb/3179577

dbxtool 0.6

• make "dbxtool -l" work correctly with not-well-known GUIDs

dbxtool 0.5

• make applying to dbx when it doesn't exist work (lersek)
• make displaying KEK work right

dbxtool 0.4

This is the exciting new 0.4 release!