[Nitro] Make Postgres work again

[Jonathan Buch]

Hi,

Michael Fellinger and me have been working very hard to make things look a  
little better when using the Postgres adapter.

It's quite a massive patch, rough changelog:

* Fix the testcases.  Many just were out of date and didn't reflect the  
recent changes.
* Implement transactions in Postgresql
* Create a compatibility layer when the postgres-pr library is used for  
Postgres.
* Hide the NOTICE messages when not needed (Logger.debug instead of  
$stdout)
* Change aggregation calculation, use the `resolve_options` instead of  
incompletely duplicating the work it does.
* Results of psql have been of type PGresult where it should've been PGrow
* rename all occurances of prop_accessor by attr_accessor
* add `String` to each Og `property` where it was missing
* Many many more small bugfixes around Og tests

George, please apply.

Jo

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