Many Fixes and Workarounds

Proof:
* Alert user if the root folder ("###000-###999/") doesn't exist.
* Alter Proof Page printing so that it prints from the Acrobat PDF file
rather than from InDesign.
* Various other minor tweaks.
* Bumped version number up to v2.60.

Output:
* Alter Spec Page printing so that it prints from the Acrobat PDF file
rather than from InDesign.
* When creating a Digital file, turn the imprint area into a solid
white path with no stroke--for alignment purposes on the printer.
* Adjust Die creation so it recognizes DEBOSS and EMBOSS better.
* Various other minor tweaks.
* Bumped version number up to v2.60.