Add a DataFrame.show() method pls!
'print df' will give something like below if the dataframe 'df' is big to fit into the screen :

<class 'pandas.core.frame.DataFrame'>
MultiIndex: 41955 entries, (u'000002', u'20061231') to (u'603366', u'20120630')
Columns: 147 entries, STK_ID to EPS
dtypes: float64(135), object(12)

But most of the time, I want to have a glimpse of the data , which help to know what happened to the dataframe.

Can Pandas developers add a 'show()' method to DataFrame object to display part of the data inside ? Namely, show the four corner (up_left, up_right, down_left, down_right) data, and use '...' to represent the omitted part ? 

somewhat like :

```
             STK_ID  RPT_Date STK_Name  ..  OprCF_PS    EPS
```

STK_ID RPT_Date  
000002 20061231  000002  20061231      万科A  ..    -0.692  0.526
       20070331  000002  20070331      万科A  ..    -0.741  0.140
       20070630  000002  20070630      万科A  ..    -0.454  0.254
       ...............   .............   ...............     ...........  ...    ..........   .....
       20071231  000002  20071231      万科A  ..    -1.519  0.705
       20080331  000002  20080331      万科A  ..    -0.207  0.105
