Config validation

Add field checks for configuration file. Uses tests/input_files/config.yaml as template and compares current config fields to this one.

The tests/input_files/config.yaml is extended to use the field optional to mark certain fields as optional (i.e. can be deleted). This requires a new md5 sum in tests/test_scripts_prepare_inputs_table/expected_output.md5.

Also adds the possibility to add optional author information into the multiqc report.

Closes #78 (closed) and #174 (closed)

scripts/prepare_inputs.py

@@ -678,9 +678,10 @@ def main(args):
   salmon_indexes: "{salmon_indexes}"
   star_indexes: "{star_indexes}"
   alfa_indexes: "{alfa_indexes}"
-  report_description: "{args.description}"
-  report_logo: "{args.logo}"
-  report_url: "{args.url}"
+  optional:
+    report_description: "{args.description}"
+    report_logo: "{args.logo}"
+    report_url: "{args.url}"
 ...
 '''
     args.config_file.write(config_file_content)