Updated MySQL scripts to work with new SMTP feature.

Closes #34
Closes #26

SQL/mysql/2018121800.sql

@@ -0,0 +1,29 @@
+ALTER TABLE
+  ident_switch
+CHANGE
+  host
+  imap_host varchar(64);
+
+ALTER TABLE
+  ident_switch
+CHANGE
+  port
+  imap_port int;
+
+ALTER TABLE
+  ident_switch
+ADD COLUMN
+	smtp_host
+    varchar(64);
+
+ALTER TABLE
+  ident_switch
+ADD COLUMN
+  smtp_port
+		int
+		CHECK(smtp_port > 0 AND smtp_port <= 65535);
+
+ALTER TABLE
+  ident_switch
+DROP COLUMN
+  delimiter;