Two-Sided Stirrers & Piks

* Since two-sided stirrers & pike do not have an "artPad" nor
"artPadBack" pageItem, I've added code to use the "artProof" and
"artProofBack" pageItems for extracting the .EPS file(s) instead.
* Fixed the old 'sidedness.toLowerCase().indexOf("2-sided") > -1' code
throughout script to reflect the better
'/2[-_\s]sided/i.test(sidedness)' method.
* Changed a couple of 'document.pages.length' checks from '40' to '44'
to account for new multi-color napkins.
* Bumped version number up to v2.35.