Multi-Product Update v1.00

[michael_s]

Removed support for UPS XML dimensions and ready to ship, maintaining feature "update only products that were changed" (little bit changed; earlier version does not work for me).
Reformatted number_format to english notation, without comma for thousands and dot for decimals. Added a search box to find products in admin faster from product_updates page.
Added feature to generate different products_last_modified values in database (thanks OSdave for your help), with sorting, useful for show date ordered listings (an rss channel for products, for example).
Add javascript to replacing commas to periods and alert the admin if a value entered is not correct. Arrow icons moved (and unified in only one location) to images folder of admin.
Added spanish language.
Added a box in left column of admin.
Used in http://www.carballino.eu/shop/

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