Change default product list to date added descend (newest first)

Change the default product listing in products and search the newest products will be the first place
from default:
product sort order ascend 
to:
date added descend.

1.1 UPDATE:
- on request added quantity descend replace file too.
- tested and aproved in 2.0.0.0

if you have any problem please fell free to contact:
gegenyrichard@netra.hu - Richard - https://www.renovatiomarketing.hu

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