Fix errors without converting

[joergbrech]

Currently, some common CPACS issues can be fixed during conversion, but this fix is only applied if we update from CPACS 2 to CPACS 3. It would be convenient if we could apply the fixes without conversion, e.g. fix a CPACS 3.1 file.

cpacs2to3/cpacs2to3/cpacs_converter.py

Lines 511 to 517 in f004b97

	def upgrade_2_to_3(cpacs_handle, args):
	filename = args.input_file
	if args.fix_errors:
	file_has_changed = uid_manager.fix_invalid_uids(cpacs_handle)
	file_has_changed = fix_empty_elements(cpacs_handle) or file_has_changed
	file_has_changed = fix_guide_curve_profile_element_names(cpacs_handle) or file_has_changed