Make operators do smarter sparse conversions on permutation matrices. * Sparse.cc (Sparse<T>::Sparse): New templated ctor, plus two instantiations. * Sparse.h (Sparse<T>): Declare new ctor. * MSparse.h (MSparse): Give this class a PermMatrix ctor. * boolSparse.h (BoolSparseMatrix): Ditto. * dSparse.cc: Refactor PermMatrix ctor, moved into common parent class. * dSparse.h (SparseMatrix): Ditto. * op-pm-sm.cc: Declare and install smarter permutation matrix operators. * ov-perm.cc (octave_perm_matrix): Declare new virtual function override. * ov-perm.cc (sparse_bool_matrix_value): Override this virtual function.

--- a/liboctave/boolSparse.h
+++ b/liboctave/boolSparse.h
@@ -57,6 +57,8 @@
 
   explicit SparseBoolMatrix (const boolNDArray& a) : Sparse<bool> (a) { }
 
+  explicit SparseBoolMatrix (const PermMatrix& a) : Sparse<bool> (a) { };
+
   SparseBoolMatrix (const Array<bool>& a, const idx_vector& r,
                     const idx_vector& c, octave_idx_type nr = -1,
                     octave_idx_type nc = -1, bool sum_terms = true,