[added testing and plotting] restructuring the plotting library

GPy/plotting/gpy_plot/__init__.py

@@ -0,0 +1,29 @@
+def update_not_existing_kwargs(to_update, update_from):
+    return to_update.update({k:v for k,v in update_from.items() if k not in to_update})
+
+#===============================================================================
+# Implement library specific defaults in the specific plotting librarys defaults.py file.
+# The following lines ensure, that an empty kwarg gets returned, when accessing a not 
+# existing default
+from .. import plotting_library as pl
+from collections import defaultdict
+class defaultdict(defaultdict):
+    def __getattr__(self, *args, **kwargs):
+        return defaultdict.__getitem__(self, *args, **kwargs)
+defaults = defaultdict(dict, **pl.defaults.__dict__)
+pl.defaults = defaults
+#===============================================================================
+
+#===============================================================================
+# Make sure that the necessary files and functions are
+# defined in the plotting library:
+assert hasattr(pl, 'get_new_canvas'), "Please implement a function to get a new canvas for the specific library in plotting_library.get_new_canvas(**kwargs)"
+assert hasattr(pl, 'plot'), "Please implement a function to plot a simple line"
+assert hasattr(pl, 'scatter'), "Please implement a function to plot a simple scatterplot"
+#assert hasattr(pl, 'xerrorbar'), "Please implement a function to plot an errorbar along the xaxis"
+#assert hasattr(pl, 'xerrorbar'), "Please implement a function to plot an errorbar along the yaxis"
+#assert hasattr(pl, 'fill'), "Please implement a function to fill a section between points"
+#assert hasattr(pl, 'imshow'), "Please implement a function to plot an image in the given boundaries"
+#===============================================================================
+
+from . import data_plots, gp_plots