No prompt for to recalculate shipping when store disabled shipping,
Cart recalculate shipping required utility routine also respects setting
fixed typo in _wpsc_localize_checkout_related_options function name
removed wpsc_core_store_use_shipping, replaced with call to wpsc_is_shipping_enabled
Merge pull request #1267 from JeffPyeBrook/pr-1235-no-recalc-prompt-when-store-doesnt-ship

Don't prompt for to recalculate shipping when store disabled shipping