set up integration test for Snakefile in dedicated folder; current test case was left untouched for the time being, despite requiring large input files
set up DAG chart creation test in dedicated folder; script creates an SVG representation of the workflow DAG at images/workflow_dag.svg
both tests have been added to the GitLab CI/CD configuration; the latter test ensures that always the latest version of the
all tests are now located inside subdirectories of tests/; test scripts and configuration files for test runs etc. have been moved to the appropriate test directories
for the time being, required input files for each test are placed within the individual test directories; a layout for common test files should be introduced later and paths and bind paths in tests adapted