allow disabling of permutation and diagonal matrices * ov.cc (Vdisable_diagonal_matrix, Vdisable_permutation_matrix): New static variables. Use them in octave_value constructors to determine whether to create diagonal and permutation matrices. (Fdisable_diagonal_matrix, Fdisable_permutation_matrix): New functions. * octave.cc (maximum_braindamage): Disable permutation and diagonal matrices for --traditional option. * CMatrix.cc, CMatrix.h, dMatrix.cc, dMatrix.h, fCMatrix.cc, fCMatrix.h, fMatrix.cc, fMatrix.h: New conversion constructors. * basics.txi, diagperm.txi: Update docs for change.

--- a/liboctave/array/dMatrix.h
+++ b/liboctave/array/dMatrix.h
@@ -70,6 +70,10 @@
 
   explicit Matrix (const DiagMatrix& a);
 
+  explicit Matrix (const MDiagArray2<double>& a);
+
+  explicit Matrix (const DiagArray2<double>& a);
+
   explicit Matrix (const PermMatrix& a);
 
   explicit Matrix (const boolMatrix& a);