Handling paths to external files

[bl-young]

Documenting what was discussed today that we sometimes have difficulty running external methods.

For example, to run the state GHG Method GHG_stateCBEI_2019.yaml, we need to pass the following external folder:

<path>/GHGbyindustrydocs/flowsa/

flowsa
|--activitytosectormapping
|--flowbysectoractivitysets
|--flowbysectormethods
     |--GHG_stateCBEI_2019.yaml

In load_yaml_dict then the method folder is identified here:

flowsa/flowsa/common.py

Line 131 in 4efcd5a

folder = f'{filepath}flowbysectormethods/'

But later only the parent path is passed here:

flowsa/flowsa/common.py

Line 143 in 4efcd5a

config = flowsa_yaml.load(f, filepath)

such that later when searching for other files the external path that is explored is only still <path>/GHGbyindustrydocs/flowsa/

flowsa/flowsa/flowsa_yaml.py

Lines 27 to 34 in 4efcd5a

	for folder in [
	*loader.external_paths_to_search,
	flowsa.settings.sourceconfigpath,
	flowsa.settings.flowbysectormethodpath
	]:
	if path.exists(path.join(folder, file)):
	file = path.join(folder, file)
	break