Remove the Tk interfaces

These were a constant source of trouble.  Tkinter likely has multiple
memory leaks that OfflineIMAP was tickling.  I never used these, so poof,
goodbye.

offlineimap.conf

@@ -51,8 +51,6 @@ maxsyncaccounts = 1
 # fails, the second, and so forth.
 #
 # The pre-defined options are:
-# Tk.Blinkenlights -- A graphical interface, shows LEDs and a single log
-# Tk.VerboseUI -- A graphical interface, shows logs per thread
 # Curses.Blinkenlights -- A text-based (terminal) interface similar to
 # Tk.Blinkenlights
 # TTY.TTYUI -- a text-based (terminal) interface
@@ -62,7 +60,7 @@ maxsyncaccounts = 1
 #
 # You can override this with a command-line option -u.
 
-ui = Tk.Blinkenlights, Tk.VerboseUI, Curses.Blinkenlights, TTY.TTYUI,
+ui = Curses.Blinkenlights, TTY.TTYUI,
      Noninteractive.Basic, Noninteractive.Quiet
 
 # If you try to synchronize messages to a read-only folder,
@@ -116,30 +114,6 @@ footer = "\n"
 # Note that this filter can be used only to further restrict mbnames
 # to a subset of folders that pass the account's folderfilter.
 
-##################################################
-# Blinkenlights configuration
-##################################################
-
-[ui.Tk.Blinkenlights]
-
-# Specifies the default number of lines in the log.
-
-loglines = 5
-
-# Specifies how many lines are in the scrollback log buffer.
-
-bufferlines = 500
-
-# If true, says that the log should be enabled by default.
-# Otherwise, you have to click "Show Log" to enable the log.
-
-showlog = false
-
-# Sets the font information.
-
-fontfamily = Helvetica
-fontsize = 8
-
 ##################################################
 # Accounts
 ##################################################