Update server-postgresql.txt

adding the ip6 equivalent - my first installs on CentOS I missed this, and was baffled why the DB connection was failing - it didn't help that this wasn't in the docs.
adding ip6 connection line to pg_hba.conf

I was following the docs on my original CentOS installs, where the IP6 local connection was being tried and failing, since this was missing from the docs.
Update auto-generated properties

Repository: openmicroscopy/ome-documentation
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Generated by OMERO-5.0-latest-docs-autogen#79 (http://ci.openmicroscopy.org/job/OMERO-5.0-latest-docs-autogen/79/)
Merge pull request #966 from snoopycrimecop/dev_5_0/latest/autogen

Update auto-generated properties
Merge pull request #968 from hflynn/rebased/dev_5_0/patch-3

adding ip6 connection line to pg_hba.conf (rebased onto dev_5_0)
Merge pull request #967 from hflynn/rebased/dev_5_0/patch-2

adding ip6 pg_hba.conf connection line (rebased onto dev_5_0)