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