Autosuggest product tags on bulk edit

This tiny change helps users quickly add tags to products using bulk
edit.
Code Standards: Finish up admin includes

* fixed indentation - swapped spaces for tabs at start of line, swapped
tabs for spaces min-line for alignment
* removed instances of `@return void` and `@access public`

@see http://make.wordpress.org/core/handbook/coding-standards/php/

@see part 1: #6157
Doc return type update.
Merge pull request #6876 from tamarazuk/coding-standards-part-2

Code Standards Part 2
Merge pull request #6874 from tamarazuk/bulk-edit-tag-suggest

Autosuggest product tags on bulk edit
check if offset exists in breadcrumb.php

Closes #6878
Change structure of check to appease claudio
Merge pull request #6879 from bryceadams/patch-6878

check if offset exists in breadcrumb.php