Added seed before `predict`

For some reasons the predict.train function is not always deterministic --> setting a seed

First stable release

Minor adjustments to various parts of the workflow

Various issues fixed

A number of open issues and feature requests have been addressed.

First pre-release

This release contains all relevant scripts for IMC data analysis. Scripts still need to be checked for typos and missing pieces.

Biorxiv submission

Code and htmls for the bioRxiv preprint of the workflow.