XNAT-3591 Added label field to scripts.

...rg/xnat/event/listeners/AutomationEventScriptHandler.java

.../java/org/nrg/xnat/helpers/prearchive/PrearcDatabase.java

...n/java/org/nrg/xnat/restlet/resources/ScriptResource.java

src/main/webapp/WEB-INF/views/spawner/elements.jsp

src/main/webapp/scripts/xnat/app/eventsManager.js

src/main/webapp/scripts/xnat/app/scriptEditor.js

src/main/webapp/scripts/xnat/app/siteEventsManager.js

src/main/webapp/xnat-templates/screens/EditScript.vm

src/main/webapp/xnat-templates/screens/Scripts.vm

...reens/xnat_projectData/xnat_projectData_summary_manage.vm