Generate MOR-tiers for VanKampen

[JeltevanBoheemen]

For the VanKampen corpus, see https://github.com/UUDigitalHumanitieslab/anncor-data, generate MOR-tiers using the add_mor_to_cha.py script.

Optionally, implement #26 while working on this.

[JeltevanBoheemen]

The CHAT files are added to the anncor-data repository.