Proposal to fix postgresql package maintainance nightmare

[Michael Grünewald]

> On 21 Jul 2015, at 11:46, Baptiste Daroussin <bapt at freebsd.org> wrote:
> - Impossible to have tools from both old and new version at the same time (which
> is necessary to upgrade db and prepare upgrades of db) …

Could not jails be used to solve these issues by running the two (…) required versions
in jailed environments?  There is a little bit of setup, but if by any chance you
are using some variation of the immutable server pattern, it should stay very low.