added support for Model migrations

now we have a table core.migration and each model (User, Group, Item, ItemContent and a new Migration) have its own
row in the table with a version number

added to config:
db_make_migration_if_needed and db_stop_if_migration_fails (need description yet)

winixd/models/user.cpp

@@ -137,6 +137,47 @@ return false;
 }
 
 
+bool User::do_migration(int & current_table_version)
+{
+	bool ok = true;
+
+	ok = ok && morm::Model::do_migration(current_table_version, 1, this, &User::do_migration_to_1);
+
+	return ok;
+}
+
+
+
+
+bool User::do_migration_to_1()
+{
+	const char * str = R"sql(
+		CREATE TABLE core."user" (
+			id serial,
+			login character varying(255),
+			password character varying(255),
+			email character varying(255),
+			notify integer,
+			pass_type integer,
+			pass_hash_salted boolean,
+			pass_encrypted bytea,
+			super_user boolean,
+			env text,
+			aenv text,
+			status integer,
+			locale_id integer,
+			time_zone_id integer,
+			has_pass boolean
+		);
+	)sql";
+
+	db_query(str);
+	return true; // IMPROVEME remove me in the future: this is only for a moment until we do migration on all our sites
+}
+
+
+
+