Enhance printing method for imposing N UP

[Valdemar Peña]

Hi, thanks for reading, it could be a time saver if N UP impose method would have a "center to media" check box, also "Center from printable area". I do always have to manually calculate the center for this impose method.

Also, add a function that rotates imposing like rotate 180 degree to columns or rows,  this feature benefits when the artwork has a solid color with bleed and sending to cutting machines; this scenario does apply to any job smaller in size than the printing media.