[dev-context] CGModules new: Environment for collating marks version 2.0 published.

Willi Egger submitted the new Environment for collating marks package. Version number: 2.0 License type: Public Domain Wants to be in ConTeXt distribution: yes Wants to be synced with CTAN: yes Summary description: Environment to place collating marks on the spine of a section Announcement text: ---------------------------------------------------------------------- This is a replacement of the version from 2011. ----------------------------------------------------------------------