Corrected a problem in which "cellname delete" never cleared the

cell name from the cell name hash table.  So when "cellname rename"
was changed recently to prevent changing the name of a cell that
already exists, the suggested recipe for R-C extraction no longer
works:  "load x; flatten y; load y; cellname delete x; cellname
rename y x".  Solved by adding a HashRemove() function to the
cell deletion routine.  Thanks to Egor Lukyachenko for reporting
the issue (Github issue tracker #467).

VERSION

@@ -1 +1 @@
-8.3.564
+8.3.565

database/DBcellname.c

@@ -1944,6 +1944,7 @@ DBCellDeleteDef(cellDef)
     entry = HashFind(&dbCellDefTable, cellDef->cd_name);
     ASSERT(HashGetValue(entry) == (ClientData) cellDef, "DBCellDeleteDef");
     HashSetValue(entry, (ClientData) NULL);
+    HashRemove(&dbCellDefTable, cellDef->cd_name);
     if (cellDef->cd_props)
 	DBPropClearAll(cellDef);