Make self.ui available in all Repository() derivatives

This enables us to make use of self.ui in all repositories without
having to import and use getglobalui() in all types of repositories and
all places.

Note that this patch only makes this available, it does not yet make use
of it.

Signed-off-by: Sebastian Spaeth <Sebastian@SSpaeth.de>
Signed-off-by: Nicolas Sebrecht <nicolas.s-dev@laposte.net>

offlineimap/repository/Base.py

@@ -45,6 +45,7 @@ def LoadRepository(name, account, reqtype):
 
 class BaseRepository(CustomConfig.ConfigHelperMixin):
     def __init__(self, reposname, account):
+        self.ui = getglobalui()
         self.account = account
         self.config = account.getconfig()
         self.name = reposname
@@ -166,7 +167,7 @@ class BaseRepository(CustomConfig.ConfigHelperMixin):
                 except (KeyboardInterrupt):
                     raise
                 except:
-                    getglobalui().warn("ERROR Attempting to create folder " \
+                    self.ui.warn("ERROR Attempting to create folder " \
                         + key + ":"  +traceback.format_exc())
 
         #