allow renaming of variables in workspace viewer * main-window.h, main-window.cc (main_window::handle_rename_variable_request): New function. (main_window::construct_octave_qt_link): Connect _workspace_model::rename_variable to main_window::handle_rename_variable_request. (main_window::rename_variable_callback): New function. * octave-qt-link.h, octave-qt-link.cc (octave_qt_link::do_set_workspace, octave_qt_link::set_workspace_signal): New argument, top_level. Change all uses. * octave-link.h, octave-link.cc (octave_link::post_event): Provide two-argument version. (octave_link::set_workspace, octave_link::do_set_workspace): New argument, top_level. Change all uses. * workspace-model.h, workspace-model.cc (workspace_model::flags): Conditionally add Qt::ItemIsEditable to flags. (workspace_model::data): Also return value for column 0 if it is editable. (workspace_model::setData): Handle setting new values. (workspace_model::_top_level): New data member. (workspace_model::set_workspace): New argument, top_level. (workspace_model::rename_variable): New signal. * workspace-view.h, workspace-view.cc (variable_name_editor): New class. (workspace_view::var_name_editor): New data member. (workspace_view::workspace_view): Initialize it. Set var_name_editor as delegate for column 0. (workspace_view::~workspace_view): Delete var_name_editor. (workspace_view::item_double_clicked): Delete. * symtab.h (symbol_table::rename, symbol_table::do_rename, symbol_table::symbol_record::rename): New functions.

To cite GNU Octave in publications use:

  John W. Eaton, David Bateman, and Søren Hauberg (2009).  GNU Octave version
  3.0.1 manual: a high-level interactive language for numerical computations.
  CreateSpace Independent Publishing Platform.  ISBN 1441413006,
  URL http://www.gnu.org/software/octave/doc/interpreter/

A BibTeX entry for LaTeX users is:

  @book{,
    author    = {John W. Eaton and David Bateman and S\oren Hauberg},
    title     = {{GNU Octave} version 3.0.1 manual: a high-level interactive language for numerical computations},
    publisher = {CreateSpace Independent Publishing Platform},
    year      = {2009},
    note      = {{ISBN} 1441413006},
    url       = {http://www.gnu.org/software/octave/doc/interpreter},
  }

We have invested a lot of time and effort in creating GNU Octave, please cite it
when using it.  See also `citation pkgname' for citing Octave packages.