AutoNum: a lot of changes

Schemas now get saved with a UUID and do not have to be looked up according to the form. They can be renamed and it gets reflected in existing elements. The GUI for
editing them is now much easier, e.g. forms can be reshuffled. A formula can be applied. Many options now also for conductors and sheets.

sources/diagram.cpp

@@ -16,6 +16,7 @@
 	along with QElectroTech.  If not, see <http://www.gnu.org/licenses/>.
 */
 #include "diagram.h"
+#include "autoNum/elementautonumschemecommand.h"
 
 #include "ElementsCollection/elementcollectionhandler.h"
 #include "TerminalStrip/GraphicsItem/terminalstripitem.h"
@@ -1290,6 +1291,13 @@ QDomDocument Diagram::toXml(bool whole_content, bool is_copy_command) {
 	std::stable_sort(list_conductors.begin(), list_conductors.end(),
 			  [](Conductor *a, Conductor *b) { return conductorSortKey(a) < conductorSortKey(b); });
 
+		// A copy carries the numberings its elements follow: pasted into
+		// another project, which does not know them, it can offer to import
+		// them (see PasteNumberingImport)
+	if (is_copy_command) {
+		ElementAutoNumSchemeCommand::writeCopiedSchemes(document, dom_root, m_project, list_elements);
+	}
+
 	// correspondence table between the addresses of the terminals and their ids
 	// table de correspondance entre les adresses des bornes et leurs ids
 	QHash<Terminal *, int> table_adr_id;