fix broken icon path after new icon structure in GUI * community-news.cc: use window icon configured in the preferences * documentation-dock-widget.cc (documentation_dock_widget) * files-dock-widget.cc (files_dock_widget) * history-dock-widget.cc (history_dock_widget) * terminal-dock-widget.cc (terminal_dock_widget) * variable-editor.cc (variable_editor) * workspace-view.cc (workspace_view) do not set window icon here as it is set in the main window * gui-preferences-dw.h: organize dw_icon_set_names in a hash * file-editor.cc (notice_settings): fix path to tab close icon on mac * find-dialog.cc (find_dialog): do not set window icon here, it is already set by the editor * main-window.cc (notice_settings): set dok widget icons using the new hash structure of available icon sets (construct): use global const settings instead of literal string for main window icon * octave-qobject.cc (release_notes_widget): pass base qobject to the release note constructor * release-notes.cc (release_notes): get qbase object as argument, get desired window icon from settings * release-notes.h: constructor with base object as argument * variable-editor.cc (toplevel_change): use icon path from const preferences instead of literal strings * welcome-wizard.cc (make_octave_logo): use icon path from const preferences instead of literal strings

## INLINE contstructor

%!shared fn
%! fn = inline ("x.^2 + 1");
%!assert (feval (fn, 6), 37)
%!assert (fn (6), 37)
%!assert (feval (inline ("sum (x(:))"), [1 2; 3 4]), 10)
%!assert (feval (inline ("sqrt (x^2 + y^2)", "x", "y"), 3, 4), 5)
%!assert (feval (inline ("exp (P1*x) + P2", 3), 3, 4, 5), exp (3*4) + 5)

## Test input validation
%!error inline ()
%!error <EXPR must be a string> inline (1)
%!error <N must be an integer> inline ("2", ones (2,2))
%!error <N must be a positive integer> inline ("2", -1)
%!error <additional arguments must be strings> inline ("2", "x", -1, "y")

## FORMULA

%!assert (formula (fn), "x.^2 + 1")
%!assert (formula (fn), char (fn))

## ARGNAMES

%!assert (argnames (fn), {"x"})
%!assert (argnames (inline ("1e-3*y + 2e4*z")), {"y"; "z"})
%!assert (argnames (inline ("2", 2)), {"x"; "P1"; "P2"})

## VECTORIZE

%!assert (formula (vectorize (fn)), "x.^2 + 1")
%!assert (formula (vectorize (inline ("1e-3*y + 2e4*z"))), "1e-3.*y + 2e4.*z")
%!assert (formula (vectorize (inline ("2^x^5"))), "2.^x.^5")