sysadmin: Make 9.2+ the recommended PostgreSQL version
sysadmin: Update the windows PostgreSQL docs
sysadmin: Update recommended PostgreSQL version to 9.2 in installation notes
sysadmin: Refer to trac floating point ticket #12466
Merge pull request #877 from rleigh-dundee/pg-float

Update recommended PostgreSQL version to 9.2 for float bug fix