Merged in paulis/processmaker/PM-2211 (pull request #1960)

PM-2211: I added new column Error_mail in Email's log

workflow/engine/data/mysql/schema.sql

@@ -124,6 +124,7 @@ CREATE TABLE `APP_MESSAGE`
 	`APP_MSG_ATTACH` MEDIUMTEXT,
 	`APP_MSG_SEND_DATE` DATETIME  NOT NULL,
 	`APP_MSG_SHOW_MESSAGE` TINYINT default 1 NOT NULL,
+	`APP_MSG_ERROR` MEDIUMTEXT default '' NOT NULL,
 	PRIMARY KEY (`APP_MSG_UID`)
 )ENGINE=InnoDB  DEFAULT CHARSET='utf8' COMMENT='Messages in an Application';
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