add sales controller
modify dataTable to fit colResizable to show all
add helper: tf,tm
add helper: color_tag
add product#index, #update, add helper: rel_hash
add product#new
product: add sale_type, etc
add inplace/no-input, dataTable/opt, disable colResizable
add selectAll/selectOne for dataTable
products: add supplier,etc; add select checkbox; add update_ex