Update WPSC_Purchase_Log::delete() to properly delete a purchase log and associated cart items, form data and claimed stock.
Deprecate wpsc_delete_purchlog(). Use WPSC_Purchase_Log::delete().
Make WPSC_Purchase_Log::delete() a non-static method.
Check wether log is deleted when performing purchase log action.
Check WPSC_Purchase_Log::delete has NO parameter before doing _wpsc_deprecated_argument().
Merge pull request #1665 from benhuson/wpsc_delete_purchlog

WPSC_Purchase_Log::delete() should delete related cart items, form data and claimed stock