`calculate_stats.py loop` computes some stats that are unused by the dashboard

[andylolz]

calculate_stats.py loop takes a reeeeally long time to run.

Profiling suggests by_hierarchy is the slowest function. validation, codelist_values and codelist_values_by_major_version are pretty slow, too.

ruleset_passes is not only slow, it’s also unused by the dashboard. So that can and probably should be disabled.

[andylolz]

In case it’s useful to know, you can disable stats by prefixing their function name with an underscore:

IATI-Stats/statsrunner/shared.py

Lines 1 to 5 in 1d20ed1

	def use_stat(stats, name):
	if hasattr(stats, 'enabled_stats'):
	return name in stats.enabled_stats
	else:
	return not name.startswith('_')

[andylolz]

codelist_values and codelist_values_by_major_version are both quite expensive. They also do almost exactly the same thing as each other.

It wouldn’t be difficult to scrap codelist_values, and refactor the dashboard to use list(codelist_values_by_major_version.values())[0] in place of codelist_values.