v0.9.5

v0.9.5 supports arbitrary node id and zone id, which can only be taken as integer values in all the previous releases. Besides, it includes several other updates.

1. Add OS check in perform_network_assignment_DTALite() to make sure DTALite runs properly on Windows.
2. Remove legacy naming inherited from DTALite_s.py, which has been deprecated.
3. Remove format_type from demand_files in settings.yml and its implementation from read_settings() in utils.py.