Updte sample_inputs to work as standalone (not imported library).

sample_inputs/new_cohort.py

@@ -1,5 +1,12 @@
-## Additional mappings customised to my special cohort
+import os
+import sys
+# Include src/ directory in the module search path.
+current_dir = os.path.dirname(os.path.abspath(__file__))
+parent_dir = os.path.dirname(current_dir)
+sys.path.append(os.sep.join([parent_dir, "src"]))
+import clinical_etl.mappings
 
+## Additional mappings customised to my special cohort
 def sex(data_value):
     # make sure we only have one value
     mapping_val = mappings.single_val(data_value)