Gui support for enhancement of dbstop. * octave-qscintilla.cc (contextMenuEvent): Capture right-click in the left margins to show a context menu for "dbstop if...". * octave-qscintilla.{cc,h} (contextmenu_break_condition): new function * file-editor-interface.h: pass condition to handle_update_breakpoint_marker_request * file-editor-tab.{cc,h}: (file_editor_tab, bp_info, handle_request_add_breakpoint, next_breakpoint, previous_breakpoint, do_breakpoint_marker, add_breakpoint_callback): Allow conditional breakpoint markers * file-editor-tab.cc (handle_context_menu_break_condition): new function * file-editor.{cc,h} (request_open_file, add_file_editor_tab, handle_delete_debugger_pointer_request): pass bp conditions. * marker.{cc,h} (marker, construct, handle_report_editor_linenr): pass breakpoint conditions * main-window.{cc,h} (handle_update_breakpoint_marker_request): pass breakpoint condition. * octave-link.h (update_breakpoint): pass breakpoint condition. * octave-qt-link.{cc,h} (do_update_breakpoint): pass breakpoint condition.

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