modified Easy Populate 1.2.5.6 csv (import by ID but not MODEL, and so on)

[chice]

Based on easy_populate_csv_1-2-5-6-csv.
This zip only contains the 'admin' folder,
other files are the same as the orginal one.
Because I can not upload a file larger than 50k (!!!!)

1. UTF-8 support

2. No longer using 'products_model' to identify a product, but using 'products_id'. I can not understand why they are using model at all, a strange design! Empty id means to add a new product.

3. Export CSV to a specfied encoding (eg: Excel can only handle GBK/GB2312 correctly, but not UTF-8)

NOT fully tested,
froogle is NOT tested at all and shouldn't work correctly, because I only need Full export/import.