Added missing custom fields on sale/order/info

Added missing custom fields on sale/order/info.
Shipping notes or other fields like VAT number associated to the order can be see it, without going to the user profile.
the following custom fields are implemented
select - display the user selection other options are not shown
radio - display the user selection  other options are not shown
checkbox - display the user selections  other options are not shown
text - display the data entered by the user
textarea - display the data entered by the user
date - display the data entered by the user
time - display the data entered by the user
datetime - display the data entered by the user

the only custom field not displayed or used in anyway is the file kind

All the custom fields are added at the end of the current table in each tab
the sort order is not used, the order will be alway the same: select custom fields first -> datetime custom field last, if there is more that one custom field of the same kind the order will be the same as stored on database