Program defaults and datepicker

[lubos]

@rukshakhan datepicker was never implemented on line items. There is already topic for this feature request.

Allow custom field type on sales invoice lines

Understand from guides that sales invoice line is a custom field. To get the most out of it can I expect to have the type option similar to other custom fields please @lubos ? This will be a great for many users, trust me. [46]