Implemented user pictures (closes #1158)

migrations/0125.sql

@@ -0,0 +1,21 @@
+ALTER TABLE users
+ADD picture_file_name TEXT;
+
+DROP VIEW users_dto;
+CREATE VIEW users_dto
+AS
+SELECT
+	id,
+	username,
+	first_name,
+	last_name,
+	row_created_timestamp,
+	(CASE
+		WHEN IFNULL(first_name, '') = '' AND IFNULL(last_name, '') != '' THEN last_name
+		WHEN IFNULL(last_name, '') = '' AND IFNULL(first_name, '') != '' THEN first_name
+		WHEN IFNULL(last_name, '') != '' AND IFNULL(first_name, '') != '' THEN first_name || ' ' || last_name
+		ELSE username
+	END
+	) AS display_name,
+	picture_file_name
+FROM users;