Add possibility to edit the function related to the actual keyword in editor * octave-qscintilla.cc(get_actual_word): new internal function; (context_help_doc): uses new function get_actual_word; (contextMenuEvent): new context menu for editing function of actual keyword (context_edit): function for edit action in editor file menu; (contextmenu_edit): new slot for context menu; * octave-qscintilla.h: new functions context_edit, contextmenu_edit, get_actual_word * file-editor-tab.cc(context_edit): new slot for editor menu action * file-editor-tab.h: new slot context_edit * file-editor.cc(request_context_edit): new slot for file menu entry; (construct): new entry in file menu for editing function of actual keyword; (add_file_editor_tab): connect new signal fetab_context_edit to the new slot context_edit in file_editor_tab; (set_shortcuts): enable/disable new shortcut when editor focus changes (check_actions): enable/disable new action depending on existing tabs * file-editor.h: new signal fetab_context_edit, new slot request_context_edit, new edit function action

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