The aperture macro rotation argument is now optional

This fixes a bug where the aperture macro parser didn't understand optional arguments.

Version 1.10

This feature addresses issues #26 and #27

• Bugfix: Increased the arc rounding error tolerance even further
• Feature: The global options page_size, orientation and scale_to_fit can now be
  overridden with next_page_size, next_orientation and next_scale_to_fit.

Version 1.9

This version replaces the custom Deflate algorithm with the standard ZLib library. Expected improvements include:

• Faster conversion times
• Superior adherence to the Deflate and ZLib standards.