Use self.ui rather than UIBase.getglobalui()

We have vonverted all places in folder/* to have self.ui available,
rather than having to use UIBase.getglobalui() all the
time. Unfortunately, we did not convert the users in folder/Base.py.
This patch does it belatedly. This fixes
http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=613483

Signed-off-by: Sebastian Spaeth1 <Sebastian@SSpaeth.de>
Signed-off-by: Nicolas Sebrecht <nicolas.s-dev@laposte.net>

Changelog.draft.rst

@@ -19,6 +19,8 @@ Changes
 Bug Fixes
 ---------
 
+* Fix craches for getglobalui().
+
 
 Pending for the next major release
 ==================================

offlineimap/folder/Base.py

@@ -293,7 +293,7 @@ class BaseFolder:
         except (KeyboardInterrupt):
             raise
         except:
-            UIBase.getglobalui().warn("ERROR attempting to copy message " + str(uid) \
+            self.ui.warn("ERROR attempting to copy message " + str(uid) \
                  + " for account " + self.getaccountname() + ":" + traceback.format_exc())
         
 
@@ -400,7 +400,7 @@ class BaseFolder:
         except (KeyboardInterrupt):
             raise
         except:
-            UIBase.getglobalui().warn("ERROR attempting to handle negative uids " \
+            self.ui.warn("ERROR attempting to handle negative uids " \
                 + "for account " + self.getaccountname() + ":" + traceback.format_exc())
 
         #all threads launched here are in try / except clauses when they copy anyway...
@@ -411,7 +411,7 @@ class BaseFolder:
         except (KeyboardInterrupt):
             raise
         except:
-            UIBase.getglobalui().warn("ERROR attempting to delete messages " \
+            self.ui.warn("ERROR attempting to delete messages " \
                 + "for account " + self.getaccountname() + ":" + traceback.format_exc())
 
         # Now, the message lists should be identical wrt the uids present.
@@ -423,7 +423,7 @@ class BaseFolder:
         except (KeyboardInterrupt):
             raise
         except:
-            UIBase.getglobalui().warn("ERROR attempting to sync flags " \
+            self.ui.warn("ERROR attempting to sync flags " \
                 + "for account " + self.getaccountname() + ":" + traceback.format_exc())