Only count categories if count is turned on
Adding category count to changelog.md
Removing category count for top level categories
Added speed improvement for the product count check in the category module if it is disabled. Part of the totals calculation were still being done and are unused.
Merge pull request #2086 from david-wm/v1.5.6.x

Fixed category count to be called only when count is turned on
Added formatting to number format in pp express to ensure no comma is added for items over 1000 #2216
Merge branch 'v1.5.6.x' of https://github.com/opencart/opencart into zgv1.5.6.1