A well documented advanced example program that creates a new PDF document
from an input document, performing multi-page imposition (layout) of
many pages onto one.
The pages are automatically sized, scaled, rotated, and centered to the
parent page size, and to the number of rows and columns specified. New parent
pages are added as needed.
Allows for custom page ordering, placement, sizing, rotation, margins,
and gutters. Provides an example of "NumUp" page replication.