GL2PS latest version

[Kyle Edwards]

All,

New versions of VTK use new features from upstream GL2PS:

- 2b7018cc - Add support for text alignment in PDF documents.
- f3417eb9 - Stabilize depth sort to ensure consistent results.

As part of my effort to package the upcoming VTK 9 into Debian, we will 
need the latest version of GL2PS with these features. Anton, would you 
mind doing this for me? Thank you in advance. (I am not subscribed to 
this list so please CC me in your reply.)

Kyle