Changed shares to BIGINT data type to account for BTC having far more shares than can be handled by standard INT datatype

Author: jonnybravo0311

sql/000_base_structure.sql

@@ -182,10 +182,10 @@ CREATE TABLE IF NOT EXISTS `statistics_shares` (
   `id` int(10) unsigned NOT NULL AUTO_INCREMENT,
   `account_id` int(10) unsigned NOT NULL,
   `block_id` int(10) unsigned NOT NULL,
-  `valid` int(11) NOT NULL,
-  `invalid` int(11) NOT NULL DEFAULT '0',
-  `pplns_valid` int(11) NOT NULL,
-  `pplns_invalid` int(11) NOT NULL DEFAULT '0',
+  `valid` bigint(20) NOT NULL,
+  `invalid` bigint(20) NOT NULL DEFAULT '0',
+  `pplns_valid` bigint(20) NOT NULL,
+  `pplns_invalid` bigint(20) NOT NULL DEFAULT '0',
   PRIMARY KEY (`id`),
   KEY `account_id` (`account_id`),
   KEY `block_id` (`block_id`)