This emulates Inkscape v1.3 gui remove_symbol action but also:
-Removes symbols of selected clones on canvas OR ALL symbols and clones.
-Also packaged is a Quick Remove Selected extn(.inx) using same py as main Batch inx.
-For use in managing symbol library file and is intended to aid symbol library creation only. Other uses not tested.
-"Symbols Batch Remove..." + "Quick Remove Selected Symbols" placed in Extensions>Symbols
-As with any v1.3 extension can be allocated a keyboard shortcut.
The premise for this extension is that the inbuilt symbol remove function only allows removal one symbol at a time; even using xml editor.
(Batch Add and Sort extension also available)