Issue 5661: filter params
#4459 - Add filters for product_list_widget before / after

2 new filters introduced:

* `woocommerce_before_widget_product_list`
* `woocommerce_after_widget_product_list`
#5850 - Add QR code to API credentials

This uses https://github.com/jeromeetienne/jquery-qrcode for generating
the QR code.

This is what it looks like:

![see screen shot](http://cld.wthms.co/11wpb+)

It’s small, **but**, it scans perfectly without any issues.
Only enqueue/localize on profile page
#5537 - Fix bulk edit overlap, bulkedit improvements
Change remove_order_items subqueries to inner joins.
Closes #6804
Hat tip Jason @ WPEngine
#6026 - Introduction of Sort Code 'locale' for BACS

In the admin, it will use the store’s base country to determine the
term for ‘Sort Code’.

In the front-end, it will use the customer’s billing country to
determine the term for ‘Sort Code’.

In all cases, if a locale does not have a sortcode label set, it will
use ‘Sort Code’.

**Locales have been added for:**
* AU
* CA
* IE
* IN
* IT
* NZ
* SE
* US
* GB
* ZA

But may need adjusting based on user feedback.
Fix whitespace
Merge pull request #6794 from franticpsyx/issue-5661-amendments

woocommerce_variation_is_visible/is_active filter args
Merge pull request #6812 from woothemes/remove-order-items-query-speed

Change remove_order_items subqueries to inner joins.
Merge pull request #6811 from bryceadams/patch-5537

#5537 - Fix bulk edit overlap, bulkedit improvements
merge changes
Merge pull request #6802 from bryceadams/patch-5850

#5850 - Add QR code to API credentials
Merge pull request #6799 from bryceadams/patch-4459

#4459 - Add filters for product_list_widget before / after
Updated docblock and added return statement.
Added missing docblock
Added missing docblock return statement.
Added missing param docblock.
Documentation improvement.
Spelling correction - calculdate to calculate