Minor correction to data_split-template. Remove also data_split_config-directory from .gitignore, since the cutomized datasplit-files are stored in individual training directories.

First initial release of config_train.py, which is still incomplete. .gitignore has also been adapted.

Added possibilty to name virtual env-directory to be ignored by git and correction to identifying error and logging-messages from executed Batch scripts.

This reverts commit 2c6c6954.