make all permutation matrices column permutations (bug #42418) Making all permutation matrices column permutations allows permutation matrices to be iterated over in column-major order just like any other matrix. * PermMatrix.h, PermMatrix.cc (PermMatrix::_colp): Delete member variable and all uses. (PermMatrix::transpose): Create new matrix with internal representation flipped. (PermMatrix::pos_power): New function. (PermMatrix::eye): Call the one-argument constructor which already defaults to the identity matrix. (PermMatrix::is_col_perm): Unconditionally return true. (PermMatrix::is_row_perm): Unconditionally return false. (PermMatrix::data, PermMatrix::fortran_vec, PermMatrix::pvec): Delete. (PermMatrix::col_perm_vec): New function. * lu.cc: New test. * base-lu.cc (base_lu<lu_type>::base_lu): Call transpose in ipvt initialization. * find.cc, kron.cc, pr-output.cc, ov-perm.cc, PermMatrix.cc, PermMatrix.h, Sparse.cc, dMatrix.cc, fMatrix.cc, CmplxQRP.cc, base-lu.cc, dbleQRP.cc, fCmplxQRP.cc, floatQRP.cc, Sparse-perm-op-defs.h, mx-op-defs.h: Adapt to PermMatrix changes.

--- a/libinterp/corefcn/pr-output.cc	Thu Jun 19 10:35:39 2014 -0700
+++ b/libinterp/corefcn/pr-output.cc	Wed Jun 18 19:38:40 2014 -0600
@@ -2485,11 +2485,10 @@
 
       if (pr_as_read_syntax)
         {
-          Array<octave_idx_type> pvec = m.pvec ();
-          bool colp = m.is_col_perm ();
+          Array<octave_idx_type> pvec = m.col_perm_vec ();
 
           os << "eye (";
-          if (colp) os << ":, ";
+          os << ":, ";
 
           octave_idx_type col = 0;
           while (col < nc)
@@ -2520,7 +2519,6 @@
               else
                 os << " ...\n";
             }
-          if (! colp) os << ", :";
           os << ")";
         }
       else