handle ensembles

[rvhonorato]

Despite supporting multiple molecules, prodigy does not handle ensembles:

prodigy/src/prodigy_prot/modules/parsers.py

Lines 36 to 47 in 1c53958

	# Keep first model only
	if len(s) > 1:
	logger.warning(
	(
	"[!] Structure contains more than one model."
	" Only the first one will be kept"
	)
	)
	model_one = s[0].id
	for m in s.child_list[:]:
	if m.id != model_one:
	s.detach_child(m.id)

it would be a good quality of life to handle the ensembles internally rather than with scripting on the user side

[rvhonorato]

done with #46