BUG - RPN Expressions limited to 70 characters by database

[llow]

In thold.php the max length of rpn exprsesions is 255 characters but the database has this limited to 70. Need to increase the varchar size of the expression column in thold_data and thold_template.

alter table thold_data change expression expression varchar(255) not null default '';
alter table thold_template change expression expression varchar(255) not null default '';