jfjoch_viewer: opens the serial XFEL inputs, and the files of one dataset together

The viewer reads what rugnux reads: HDF5 files with a /metadata panel table, Cheetah CXI single-panel
stacks and LCLS-I XTC streams, by their content as the raw sweeps are. The open dialog takes several
files; they are one dataset (as on rugnux's command line), and a CrystFEL geometry file among them is
their module geometry. The images are shown in detector units, at the geometry the files state.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_015CeEGgpKdfkCTJb3YNMJcu

viewer/JFJochViewerWindow.cpp

@@ -256,6 +256,8 @@ JFJochViewerWindow::JFJochViewerWindow(QWidget *parent, bool dbus, const QString
     connect(this, &JFJochViewerWindow::LoadImageRequest,
             reading_worker, &JFJochImageReadingWorker::LoadImage);
 
+    connect(menuBar, &JFJochViewerMenu::fileListSelected,
+            reading_worker, &JFJochImageReadingWorker::SetFileList);
     connect(menuBar, &JFJochViewerMenu::fileOpenSelected,
             reading_worker, &JFJochImageReadingWorker::LoadFile);
     connect(menuBar, &JFJochViewerMenu::fileOpenSelected,