new features: data reduction, angle scan panel

- new data reduction interface for more efficient multi-peak fitting.
  the new interface breaks compatibility with pre-2.0 data reduction
  functions. user-defined functions must be adapted to the new
  interface.
- new angle scan processing panel for interactive data analysis.

doc/html/namespaces.js

@@ -1,5 +1,6 @@
 var namespaces =
 [
+    [ "PearlAnglescanPanel", "namespace_pearl_anglescan_panel.html", null ],
     [ "PearlAnglescanProcess", "namespace_pearl_anglescan_process.html", null ],
     [ "PearlAreaDisplay", "namespace_pearl_area_display.html", null ],
     [ "PearlAreaImport", "namespace_pearl_area_import.html", null ],
@@ -7,6 +8,7 @@ var namespaces =
     [ "PearlArpes", "namespace_pearl_arpes.html", null ],
     [ "PearlDataExplorer", "namespace_pearl_data_explorer.html", null ],
     [ "PearlElog", "namespace_pearl_elog.html", null ],
+    [ "PearlFitFuncs", "namespace_pearl_fit_funcs.html", null ],
     [ "PearlMatrixImport", "namespace_pearl_matrix_import.html", null ],
     [ "PearlPShellImport", "namespace_pearl_p_shell_import.html", null ],
     [ "PearlScientaPreprocess", "namespace_pearl_scienta_preprocess.html", null ]