ENH: let display.notebook_repr_html control HTML repr in qtconsole again.

Where it belongs.

#2275 (comment)

It'll probably never happen that QTconsole will report it's width, let alone
in characters (variable-width font and all). Best let the user decide.

Author: y-p

RELEASE.rst

@@ -173,7 +173,8 @@ pandas 0.11.0
     when invalid shapes are passed
   - Don't suppress TypeError in GroupBy.agg (GH3238_)
   - Methods return None when inplace=True (GH1893_)
-
+  - HTML repr output for dataframs is once again controlled by the option
+    `display.notebook_repr_html`, and on by default.
   - ``HDFStore``
 
      - added the method ``select_column`` to select a single column from a table as a Series.

pandas/core/frame.py

@@ -726,8 +726,6 @@ def _repr_html_(self):
         Return a html representation for a particular DataFrame.
         Mainly for IPython notebook.
         """
-        if com.in_qtconsole():
-            raise ValueError('Disable HTML output in QtConsole')
 
         if get_option("display.notebook_repr_html"):
             fits_vertical = self._repr_fits_vertical_()