Auto-Init

The faker.faker() has to be called at the begin of each new session to reinitialize the faking engine.

When the engine is not initialized it would be nice de to reinit the engine automatically instead of the following error :

ERROR:  plpy.Error: faker is not initialized.                                                           
HINT:  Use SELECT faker.faker(); first.

This would require 3 GUC variables :

• faker.autoinit : activate the automatic reinitialisation trigger
• faker.locales : the locales of the faker engine
• faker.seed