base_country js param for order tax calculation

added  woocommerce_writepanel_params.base_country to fix tax
calculation when an order is created manually. if you click the button
calc taxes the js uses base_country to calc when no billing/shipping
country is selected. just like the the message says: "If no
billing/shipping is set it will use the store base country".
Related Products shortcode - usefull for displaying related products in tabs.
City field on shipping calc
patch shop_order.php for issue 2958

adds ` UTC` to the variable passed to `strtotime` to ensure that the `strtotime` function does not assume the local timezone when converting.
moved woocommerce_get_filename_from_url to core-functions as it is required in admin too. Closes #2949
Local Pickup: Apply country rule also when no postal codes supplied
Merge pull request #2959 from kloon/master

Related Products Shortcode
readme.
Updated ShareYourCart SDK
Fix checkmark Closes #2951.
Posted 'text' terms are not slugs. Only striptags/slashes - don't change to slugs. Closes #2955.
Fix path insert bug. Closes #2947.
Merge pull request #2960 from bengummer/issue-2958

patch shop_order.php for issue 2958
Updated it_IT
Merge pull request #2965 from Marco-G/master

Updated it_IT
Update ro_RO

frontend - 83% (not translated all the countries and currencies)
backend - 95%
Remove url params from filenames on orders in backend under Downloadable Product Permissions
Removed space
Update class-wc-gateway-bacs.php

Make bank detail labels filterable in BACS admin
Norwegian updates by Tore Hjartland