rework __dump_symbol_table__ function * symtab.h, symtab.cc (F__dump_symtab_info__): Instead of printing results, return a struct containing all the info. (symbol_table::symbol_record::symbol_record_rep::dump, symbol_table::fcn_info::fcn_info_rep::dump, symbol_table::dump, symbol_table::scope::dump): Update interface. Create and return struct. (dump_container_map, symbol_table::dump_fcn_table_map, symbol_table::scope::dump_symbols_map): New functions. (fcn_file_name): Delete static function. (symbol_table::dump_global, symbol_table::dump_functions): Delete. * ov-usr-fcn.h, ov-usr-fcn.cc (octave_user_function::dump): Update interface. Create and return struct. (octave_user_function::ctor_type_str): New function. * ov-base.h, ov-base.cc (octave_base_value::dump): Update interface. Create and return struct. * ov.h (octave_value::dump): Update interface.

--- a/libinterp/octave-value/ov-base.h	Thu Jun 22 15:20:46 2017 -0400
+++ b/libinterp/octave-value/ov-base.h	Thu Jun 22 16:23:36 2017 -0400
@@ -687,7 +687,7 @@
 
   virtual bool islocked (void) const { return false; }
 
-  virtual void dump (std::ostream& os) const;
+  virtual octave_value dump (void) const;
 
   // Standard mappers.  Register new ones here.
   enum unary_mapper_t