Keep the project database current when folios, symbols and wires change

The project database is kept up to date edit by edit, and a script's
qet.query() and the folio tables read it without a full rebuild. Three
edits left it out of date until the next rebuild:

- adding or removing a folio: the folios after it kept their old
  position and folio number, and a removed folio's diagram_info row
  stayed;
- moving a symbol: its folio cell (element.pos) stayed where the symbol
  was added;
- deleting a wire: its two ends stayed in the terminal table, which
  lists the terminals a wire ends on.

Positions and folio numbers are now written again after a folio is
added, removed or moved (one function for the three), the removed
folio's diagram_info row goes, a moved symbol's cell is written when
the database is next read (as drawing items are), and a deleted wire's
ends go unless another wire ends there.

Found by comparing the tables after random scripted edits with those
a fresh open of the saved project gives. Left alone: labels and wire
numbers made from a folio formula, which the drawing itself keeps until
the project is reopened.

Tests (tst_databasefromdocument): folioAddedAndRemoved,
movedElementCell, deletedWireTerminals; each fails without its part of
the fix.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_019Wga9B92BNurDEtxxtCDxf

sources/dataBase/projectdatabase.h

@@ -126,6 +126,8 @@ class projectDataBase : public QObject
 		void drawingItemDestroyed(QObject *object);
 			//Queue the sender()'s link rows for rewriting.
 		void linksChanged();
+			//Queue the sender() element's folio cell for rewriting.
+		void elementMoved();
 
 	public:
 
@@ -139,6 +141,8 @@ class projectDataBase : public QObject
 		void createWiringListView();
 		void createDrawingItemView();
 		void populateDiagramTable();
+		void updateFolioPositions();
+		void flushElementPositions();
 		void populateElementTable();
 		void populateElementInfoTable();
 		void populateDiagramInfoTable();
@@ -214,6 +218,10 @@ class projectDataBase : public QObject
 			//written: a link is made first and its contact group set after,
 			//so the rows are written when next read, as drawing items are.
 		QList<QPointer<Element>> m_dirty_link_elements;
+			//Elements moved since their folio cell was last written: a move
+			//sends xChanged and yChanged for every step of a drag, so the
+			//cell is written when next read, as drawing items are.
+		QList<QPointer<Element>> m_moved_elements;
 
 #ifdef QET_EXPORT_PROJECT_DB
 	public: