Adding datasourc boostrapîng instructions in leaftory generated dyncode

+ better log message for datasource bootstrap

lodel/leapi/lefactory.py

     datasource_name = repr(datasource_name),
 )
         res += em_cls_code
-        # Dyncode bootstrap instructions
+        # Dyncode fields bootstrap instructions
         bootstrap += """{classname}._set__fields({fields})
 """.format(
     classname = LeObject.name2objname(em_class.uid),
     fields = '{' + (', '.join(['\n\t%s: %s' % (repr(emfield.uid),data_handler_constructor(emfield)) for emfield in em_class.fields()])) + '}',
 )
+    bootstrap += "\n"
+    for em_class in get_classes(model):
+        # Dyncode datasource bootstrap instructions
+        bootstrap += """{classname}._init_datasource()
+""".format(
+            classname = LeObject.name2objname(em_class.uid))
     return res, set(imports), bootstrap
     

lodel/leapi/leobject.py

     @classmethod
     def _init_datasource(cls):
         expt_msg = "In LeAPI class '%s' " % cls.__name__
+        datasource_orig_name = cls._datasource
         if cls._datasource not in Settings.datasources._fields:
             expt_msg += "Unknow or unconfigured datasource %s"
             expt_msg %= (cls._datasource, cls.__name__)
             raise SettingsError(expt_msg)
-
+        
         ds_identifier = getattr(Settings.datasources, cls._datasource)
         try:
             ds_identifier = getattr(ds_identifier, 'identifier')
             expt_msg += "The datasource plugin %s seems to be invalid. Error raised when trying to import Datasource"
             expt_msg %= ds_identifier
             raise SettingsError(expt_msg)
-        logger.debug("Datasource initialized for LeObject %s" % cls.__name__)
+        log_msg = "Datasource %s initialized for LeObject %s"
+        log_msg %= (datasource_orig_name, cls.__name__)
+        logger.debug(log_msg)
 
     ##@brief Read only access to all datas
     # @note for fancy data accessor use @ref LeObject.g attribute @ref LeObjectValues instance