Dev: Fixed issue #07040: Impossibe to copy survey
Dev: Fixed issue: subquestion are new question when importing a LS2.0 lss survey
Dev: tested: copy, import LS2.0 lss,export+import LS2.1 lss with "docs/demosurvey/All question type EN/FR/ls191_sample_survey_multilingual
Dev: still a EM bug with this survey: if QCS3 is displaye: EM search for subQuestion and throw error : undefined index line 4522/em_manager_helper.php