Update to intialise plugin_dbui and fix import io.

models/main.py

@@ -17,6 +17,7 @@ Note:
 """
 from _mydb import DBURIS
 from gluon import current
+from gluon.tools import PluginManager
 
 from plugin_dbui import (configure_forms,
                          configure_grids,
@@ -70,8 +71,11 @@ T.lazy = True                                       # lazy translation
 
 # ............................................................................
 #
-# Plugin dbui configuration
+# Configure plugin_dbui
 #
+plugins = PluginManager()
+plugins.dbui.pname = "plugin_dbui"
+
 ctrl = request.controller
 fnct = request.function
 

modules/plugin_event/report_tools.py

@@ -10,10 +10,10 @@ from .dataframes import to_extjs_gridcolumns
 from .event import Event
 from gluon import current
 from gluon.storage import Storage
+from io import StringIO
 from .model_report import AGGREGATE_FUNCS
-from matplotlib_tools import ticks_and_labels
+from .matplotlib_tools import ticks_and_labels
 from plugin_dbui import Selector, Store
-from StringIO import StringIO
 
 
 FIELD_TYPES = {"gridcolumn": "string",

views/plugin_event/graph.pdf

 {{
-    import cStringIO
-    response.body = cStringIO.StringIO()
+    import io
+    response.body = io.StringIO()
 
     response.headers['Content-Type']='application/pdf'
     response.write(data, escape=False)

views/plugin_event/graph.png

 {{
-    import cStringIO
-    response.body = cStringIO.StringIO()
+    import io
+    response.body = io.StringIO()
 
     response.headers['Content-Type']='application/png'
     response.write(data, escape=False)