Hadi Moshayedi a1387f4aa8 Basic usage statistics collection. (#1656) ... Adds ```citus.enable_statistics_collection``` GUC variable, which ```true``` by default, unless built without libcurl. If statistics collection is enabled, sends basic usage data to Citus servers every 24 hours. The data that is collected consists of: - Citus version - OS name & release - Hardware Id - Number of tables, rounded to next power of 2 - Size of data, rounded to next power of 2 - Number of workers		2017-10-11 09:55:15 -04:00
..
general.m4	Basic usage statistics collection. (#1656)	2017-10-11 09:55:15 -04:00