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Add compatibility to 'Strict standards' in php 5.4.16
Add woocommerce_set_stock, woocommerce_increase_stock and woocommerce_reduce_stock action hooks
Prefix stock hooks with product_
Enable states in Hungary

The states file for Hungary is in the project for some time now, this
commit enables the use of it.
Fix state label for Hungary
Backward compatible variable_product_sync()

Adds new static sync() method to WC_Product_Variable and restores
variable_product_sync() to its former, non-static glory. Also makes
the $product_id param optional on variable_product_sync() to avoid
breaking backward compatibility.
Set default $product_id on variable_product_sync()
Merge pull request #3569 from thenbrent/non_static_variable_product_sync

Backward compatible variable_product_sync()
Merge pull request #3566 from LeGaS/master

Enable states for Hungary
Merge pull request #3564 from ragulka/stock-action-hooks

Add stock set, increase and reduce action hooks
US Spelling of fulfil Closes #3570.
Tweak email inclusion
Add separate instruction fields for BACS and CHEQUE (like COD) Closes #3291.
Filter styles and add cleaner backwards compat. Closes #3165
Show settings only when needed #3165
Syntax error in shop order class
Separate ship to options from sell to. Closes #3215.
Merge branch 'master' of https://github.com/rnt/woocommerce
Fix warning if  is null