Allow RootListPath to be specified in metatab

I *guess* this is right? Order of precedence is:

--root-list-path > metatab RootListPath > --default-configuration

Author: andylolz

flattentool/__init__.py

@@ -111,7 +111,7 @@ def decimal_default(o):
 
 
 def unflatten(input_name, base_json=None, input_format=None, output_name=None,
-              root_list_path='main', encoding='utf8', timezone_name='UTC',
+              root_list_path=None, encoding='utf8', timezone_name='UTC',
               root_id=None, schema='', convert_titles=False, cell_source_map=None,
               heading_source_map=None, id_name='id', xml=False,
               vertical_orientation=False,
@@ -179,6 +179,9 @@ def unflatten(input_name, base_json=None, input_format=None, output_name=None,
         if result:
             base.update(result[0])
 
+    if root_list_path is None:
+        root_list_path = base_configuration.get('RootListPath', 'main')
+
     if not metatab_only:
         spreadsheet_input_class = INPUT_FORMATS[input_format]
         spreadsheet_input = spreadsheet_input_class(

flattentool/lib.py

@@ -19,4 +19,6 @@ def parse_sheet_configuration(configuration_list):
             configuration['hashcomments'] = True
         if (len(parts) == 2 and parts[0].lower() == "xmlroottag"):
             configuration['XMLRootTag'] = parts[1]
+        if (len(parts) == 2 and parts[0].lower() == "rootlistpath"):
+            configuration['RootListPath'] = parts[1]
     return configuration