Localization of WPeC vars is not more explicit
* The loop that was taking the localized admin js vars out of the localization structure and putting them into the window contect has been replaced by explicit assignments.  Although it is a little more code than the prior loop it should now be easier to see what is happening.
* For localized js vars added after 3.8.14 three utility functions have been provied to access localized vars
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**Also...**
Updated an incomplete comment related to the WPeC visitor cookie

 wpsc_admin_var_get ( name )
 wpsc_admin_var_set ( name, value )
 wpsc_admin_var_isset ( name, value );
```
updated header
Verified deprecated variables are not being redeclared
Merge pull request #1127 from JeffPyeBrook/pr-issue-1110-legacy-js-vars-explicit-into-js

Localization of WPeC administration javascript variables is now more explicit