Merge all recent trunk changes, especially the fix for

ticket [369d57fb8e5ccdff06f1], but also the skip-scan improvement and
performance improvements in the b-tree code.

FossilOrigin-Name: 0b9e2c3269695713b538561d999c68097db70f0c

src/tclsqlite.c

@@ -2466,7 +2466,7 @@ static int DbObjCmd(void *cd, Tcl_Interp *interp, int objc,Tcl_Obj *const*objv){
 
     if( rc==TCL_OK ){
       rc = createIncrblobChannel(
-          interp, pDb, zDb, zTable, zColumn, iRow, isReadonly
+          interp, pDb, zDb, zTable, zColumn, (sqlite3_int64)iRow, isReadonly
       );
     }
 #endif