rebase: new upstream major release
    
    Per release notes:
    https://www.postgresql.org/docs/9.6/static/release-9-6.html
    
    Merged changes from https://github.com/devexp-db/postgresql-latest
    - removal of obsoleted patch, we can set port in postgresql.conf
    - install new files
    - hack for plpython build
    
    Version: 9.6.0-1