[FEATURE] Password prompt repeats endlessly

Problem

@gknorr has been testing, and found that if your git permissions are not configured to just use the defaults, you need to repeatedly enter your password and username. For a few times, this is OK, but given that the program downloads ~45 files, it gets irritating.

Fix

A recommendation can be sent to the user to check the following:

1. A ${HOME}/.netrc file exists
2. If not, explicitly ask the user if they want to create this file with proper permissions for gitlab
3. If it does, and gitlab.awi.de is not included, ask to include it
4. In any case, warn that if no other steps are taken to ease authentication, they will need to repeat their password often :-(