modify permission name
add permission and tab for table defs.
add table_defs controler and views.
categories finding changed to controller from view.
histories etc. changed to association from class method.
modify migrations.
add primary key number.
add unique column to bx_index_defs.
add default value column to bx_column_defs.
add migration for data type registration.
new table group page implements.(only design)