Support for duplex printer

[HYUNSEONG-KIM]

Duplex printer

The duplex printer printing contents on both side per each page.
It depends on printing devices but, the duplex printing does not perfectly fit.
Considering rotation during printing, rotatting even pages with $180^{\circ}$ angle is commonly supported.
However, addtional transformations, translation and rotation are required for perfect fitting of printing.
In addition, new printing mark is needed for measuing geometrical inbalance of front and back contents.

Done

• New duplex measuring marker routine is implemented in PrintingMark class.
• New converter class Duplex is implemented.

Remains

• UIs need to be updated for using new features
• Documentation of Duplex routine