Changes for the week 2016-10-16

v2.0: code performance improvements
v2.0: Improvement to template sets to ensure changes back to the default also update the language in the sidecart.
v2.0: Updating the status field when possible for PayPal Express reference transactions, even if the IPN is not enabled.
v2.0: Fix for PayPal Express (and other hosted payment gateways) to only send the IPN notification when the status of the transaction changes.
v2.0: Fix for Pay with Amazon not reusing existing FoxyCart customer records properly instead of creating new customer records.
v2.0: Deprecating older, unslated password hashing mechanisms.
hAPI: Removing duplicated pagination query string values.

Changes for the week 2017-04-23