Add debug box support.

If debug_boxes is enabled via the config file, then each box (picture,
text area, barcode, etc.) will have its bounding box drawn with a
translucent gray rectangle. Useful to working on the layout.
Re-do pass for credit card size.

Actually, ¼" smaller than a credit card in each dimension, to leave a
⅛" border of laminate.
Start of Westerley customizations.
Westerley message.
Sort street names. Much easier to find missing this way.
Fix bitrot, add missing streets.
Some more aliases. Terrace is both 'terr' and 'ter'. So says USPS.
Script to import units from a file.
Put Westerley in site name.
New custom message due to new, smaller custom message area.