Patch to add support for security labels on local objects

Hi,

This patch adds support to a PostgreSQL 9.1 feature called security
labels. It adds a new tab to tables, columns, aggregates, domains,
foreign tables, functions, languages, sequences, types, and views
dialogs, that allows one to add security label for each provider they
want. I suppose most users will have only one provider, but the patch
supports multi providers.

Note that this does not support a recent 9.2 feature of PostgreSQL that
adds security labels to global objects. This will be part of another
patch.


--
Guillaume
  http://blog.guillaume.lelarge.info
  http://www.dalibo.com