Fair large change to contributors

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Hello,

O.k. patch is attached, it looks pretty good on my sandbox but will
welcome feedback. The specifics are below:

* Removes developers/bios
* Creates community/contributors 
* Removes core (per Bruce M)
* Adds Active Contributors
* Adds Occasional Contributors

The following DML needs to be run as well:

update developers_types set sortorder = 1 where type = 3;
update developers set type = '3' where type = '1';
update developers_types set extrainfo = 'The following individuals are active contributors to the project. You will
generallyfind them active on the lists, working on features or supporting the PostgreSQL.org infrastructure.' where
type= '3';
 



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