Disable/hide produt size, weight, barcode, wholesale, cost

[mlocati]

When we manage products, we are presented a ton of fields, but we may not actually use all of them.

For example, someone may not want to use/manage product sizes: it'd be nice if there's a way to hide them.

What about adding these options to Settings > User Interface > Product Options?

• [ ] Hide sizes
• [ ] Hide weights
• [ ] Hide barcodes

Also, we already have these two options:

• [ ] Hide wholesale price
• [ ] Hide cost price

But we still have display them in product variants even if these options are checked: here's a screenshot of a website where the two options above are checked:

I'd hide there too the wholesale/cost price.

If it's ok, I can of course submit a pull request that implements the suggestions above.

[mlocati]

If it's ok, I can of course submit a pull request that implements the suggestions above.

See #856