Merge pull request #1271 from JeffPyeBrook/pr-1251-clear-temporary-data

Clear temporary data, whether in cache or in transient
Ensure the existence of WPSC_Term_List_Levels is checked for in javascript.  Can cause random issues on single term edit pages when other plugins conflict.
Revert 7d4613e7a820c3fcb775c40ae142ca7c6f646ab1 and clean up wpsc_item_process_file a wee bit.  Not sure what I was smoking in #688, but it better have been worth the price of admission.  Fixes #1248
Merge branch 'master' of github.com:wp-e-commerce/WP-e-Commerce
Whoops on that
Clean up wpsc_coupons a bit.  The primary improvement here is that we no longer require expiration dates.  If you have one set, it respects it.  Have a start date set, it respects it.  Neither?  Free pass.
That's a whoopsie
Merge pull request #1282 from JeffPyeBrook/pr-1280-shipping-same-as-billing-change-region-update

Regions update correctly on shipping same as billing change
Merge pull request #1287 from JeffPyeBrook/pr-1251-clear-temporary-data

Delete transient by name from saved array
Show region label as placeholder in shipping calculator
If the region label is defined us it as the default placeholder
Merge pull request #1289 from JeffPyeBrook/pr-1288-show-region-label-placeholder-in-shipping-calc

Show region label as placeholder in shipping calculator
Merge pull request #1286 from JeffPyeBrook/pr-1259-invalid-zip-codes-usps

Don't display invalid shipping choices when there is a USPS quote error
Remove commented out cached rate in UPS.  Debug cruft.
When USPS does not get a proper international rate, break loop, rather than set rate to 0.
Some cleanup (already in 3.8.14.1) from PR #1286
Clear temporary data on version change
When admin pages are displayed the version number is checked.  If the version has changed since the last check the WordPress object cache and the WPeC transients are cleared.
Merge pull request #1291 from JeffPyeBrook/pr-1290-cache-flush-on-new-version

Clear temporary data on version change
Cleanup cache invalidation routine
Fix fatal error.
Return true when there is more than one shipping quote
wpsc_have_morethanone_shipping_quote returns true when there is more than one shipping quote