proposal: custom variables management

Hello

This proposal is about access managenent to custom variables. Currently any
user can modify it, and isn't way to protect value:

Premises:
* variables are controlled from modules
* syntax of custom variables is without changes
* all modules are safe

Functions:
* reset_custom_variable(cusvar); ... set default from postgresql.conf
* revoke_custom_variable(READ|MODIFY, cusvar, roleid);
* grant_custom_variable(READ|MODIFY, cusvar, roleid);

Related discussion:
http://archives.postgresql.org/pgsql-hackers/2007-03/msg00153.php

Regards
Pavel Stehule

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