sparc: test_round_trip_frame... and test_unsorted_index
See at http://nipy.bic.berkeley.edu/builders/pandas-py2.x-sid-sparc/builds/18/steps/shell_4/logs/stdio

and that assert better has some descriptive failure message (or to be replaced with assertEqual/eq_)?

```
======================================================================
FAIL: test_round_trip_frame (pandas.io.tests.test_clipboard.TestClipboard)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/home/buildslave/nd-bb-slave-sparc-sid/pandas-py2_x-sid-sparc/build/venv/local/lib/python2.7/site-packages/pandas-0.12.0_56_g0d80c79-py2.7-linux-sparc64.egg/pandas/io/tests/test_clipboard.py", line 50, in test_round_trip_frame
    self.check_round_trip_frame(dt)
  File "/home/buildslave/nd-bb-slave-sparc-sid/pandas-py2_x-sid-sparc/build/venv/local/lib/python2.7/site-packages/pandas-0.12.0_56_g0d80c79-py2.7-linux-sparc64.egg/pandas/io/tests/test_clipboard.py", line 46, in check_round_trip_frame
    tm.assert_frame_equal(data, result)
  File "/home/buildslave/nd-bb-slave-sparc-sid/pandas-py2_x-sid-sparc/build/venv/local/lib/python2.7/site-packages/pandas-0.12.0_56_g0d80c79-py2.7-linux-sparc64.egg/pandas/util/testing.py", line 236, in assert_frame_equal
    check_less_precise=check_less_precise)
  File "/home/buildslave/nd-bb-slave-sparc-sid/pandas-py2_x-sid-sparc/build/venv/local/lib/python2.7/site-packages/pandas-0.12.0_56_g0d80c79-py2.7-linux-sparc64.egg/pandas/util/testing.py", line 197, in assert_series_equal
    assert(left.dtype == right.dtype)
AssertionError

======================================================================
FAIL: test_unsorted_index (pandas.tests.test_graphics.TestDataFramePlots)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/home/buildslave/nd-bb-slave-sparc-sid/pandas-py2_x-sid-sparc/build/venv/local/lib/python2.7/site-packages/pandas-0.12.0_56_g0d80c79-py2.7-linux-sparc64.egg/pandas/tests/test_graphics.py", line 445, in test_unsorted_index
    tm.assert_series_equal(rs, df.y)
  File "/home/buildslave/nd-bb-slave-sparc-sid/pandas-py2_x-sid-sparc/build/venv/local/lib/python2.7/site-packages/pandas-0.12.0_56_g0d80c79-py2.7-linux-sparc64.egg/pandas/util/testing.py", line 197, in assert_series_equal
    assert(left.dtype == right.dtype)
AssertionError

----------------------------------------------------------------------
Ran 3695 tests in 3708.536s
```

As you might know you can see results of builds/tests on sparc at
http://nipy.bic.berkeley.edu/waterfall?category=pandas . ATM it is polling GIT only once in 5h atm.
