Update to pkg 1.4.0.alpha1

Changes:
- Lots of cleanup in the API
- Huge refactoring to avoid using hashes where not needed
- add a new @config keyword for all files with such flags pkg will try
  automatically to merge the difference with newer version on upgrades
  a vanilla version of the file is kept in the db to allow 3 way merge
  this was the last blocker to be able to package base
- new options AUTOMERGE to prevent pkg to automatically merge @config files
- speed up upgrades by only extracting files that are different from 2 packages
- convert unique package identifier to the package name (at last !)
- drop incremental update support this was preventing allowing multiple packages
  with the same name in a remote repo
- lots of improvements in the pkg update process
- update sqlite to 3.8.7
- Change pkg audit so that it points to the http://vuxml.FreeBSD.org/freebsd/
  location by default
- Lots of fixes in the solver

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