Make the LandAnalysisScript class available from the freanalysis_land…

… module

e.g. so we can load and run it with
python3 -c "from freanalysis_land import LandAnalysisScript; LandAnalysisScript().run_analysis('$catalog', '$out_dir')"

freanalysis_land/freanalysis_land/__init__.py

@@ -0,0 +1 @@
+from .land import LandAnalysisScript