RFC: what could attribute to failed tests in TestClipboard?
Originally reported https://buildd.debian.org/status/fetch.php?pkg=pandas&arch=kfreebsd-amd64&ver=0.14.0%2Bgit17-g3849d5d-1%2Bb1&stamp=1401974000

I have tried to reproduce on (an interactive) kfreebsd-amd64 porter box, but there tests completed fine.

```
======================================================================
ERROR: test_read_clipboard_infer_excel (pandas.io.tests.test_clipboard.TestClipboard)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/«BUILDDIR»/pandas-0.14.0+git17-g3849d5d/debian/tmp/usr/lib/python2.7/dist-packages/pandas/io/tests/test_clipboard.py", line 81, in test_read_clipboard_infer_excel
    df = pd.read_clipboard()
  File "/«BUILDDIR»/pandas-0.14.0+git17-g3849d5d/debian/tmp/usr/lib/python2.7/dist-packages/pandas/io/clipboard.py", line 51, in read_clipboard
    return read_table(StringIO(text), **kwargs)
  File "/«BUILDDIR»/pandas-0.14.0+git17-g3849d5d/debian/tmp/usr/lib/python2.7/dist-packages/pandas/io/parsers.py", line 443, in parser_f
    return _read(filepath_or_buffer, kwds)
  File "/«BUILDDIR»/pandas-0.14.0+git17-g3849d5d/debian/tmp/usr/lib/python2.7/dist-packages/pandas/io/parsers.py", line 228, in _read
    parser = TextFileReader(filepath_or_buffer, **kwds)
  File "/«BUILDDIR»/pandas-0.14.0+git17-g3849d5d/debian/tmp/usr/lib/python2.7/dist-packages/pandas/io/parsers.py", line 533, in __init__
    self._make_engine(self.engine)
  File "/«BUILDDIR»/pandas-0.14.0+git17-g3849d5d/debian/tmp/usr/lib/python2.7/dist-packages/pandas/io/parsers.py", line 670, in _make_engine
    self._engine = CParserWrapper(self.f, **self.options)
  File "/«BUILDDIR»/pandas-0.14.0+git17-g3849d5d/debian/tmp/usr/lib/python2.7/dist-packages/pandas/io/parsers.py", line 1032, in __init__
    self._reader = _parser.TextReader(src, **kwds)
  File "parser.pyx", line 483, in pandas.parser.TextReader.__cinit__ (pandas/parser.c:4626)
  File "parser.pyx", line 605, in pandas.parser.TextReader._get_header (pandas/parser.c:6089)
CParserError: Passed header=0 but only 0 lines in file

======================================================================
FAIL: test_round_trip_frame (pandas.io.tests.test_clipboard.TestClipboard)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/«BUILDDIR»/pandas-0.14.0+git17-g3849d5d/debian/tmp/usr/lib/python2.7/dist-packages/pandas/io/tests/test_clipboard.py", line 69, in test_round_trip_frame
    self.check_round_trip_frame(dt)
  File "/«BUILDDIR»/pandas-0.14.0+git17-g3849d5d/debian/tmp/usr/lib/python2.7/dist-packages/pandas/io/tests/test_clipboard.py", line 57, in check_round_trip_frame
    tm.assert_frame_equal(data, result, check_dtype=False)
  File "/«BUILDDIR»/pandas-0.14.0+git17-g3849d5d/debian/tmp/usr/lib/python2.7/dist-packages/pandas/util/testing.py", line 563, in assert_frame_equal
    assert_index_equal(left.columns, right.columns)
  File "/«BUILDDIR»/pandas-0.14.0+git17-g3849d5d/debian/tmp/usr/lib/python2.7/dist-packages/pandas/util/testing.py", line 501, in assert_index_equal
    right.dtype))
AssertionError: [index] left [object Index([u'LpXeYtA8n5', u'5Y0fhC0WyE', u'tTHQGDhUd3'], dtype='object')], right [Index([u'xKjebdbwV9', u'QQD0rTKXvy', u'MdjTlE5CWY'], dtype='object') object]

======================================================================
FAIL: test_round_trip_frame_sep (pandas.io.tests.test_clipboard.TestClipboard)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/«BUILDDIR»/pandas-0.14.0+git17-g3849d5d/debian/tmp/usr/lib/python2.7/dist-packages/pandas/io/tests/test_clipboard.py", line 61, in test_round_trip_frame_sep
    self.check_round_trip_frame(dt,sep=',')
  File "/«BUILDDIR»/pandas-0.14.0+git17-g3849d5d/debian/tmp/usr/lib/python2.7/dist-packages/pandas/io/tests/test_clipboard.py", line 57, in check_round_trip_frame
    tm.assert_frame_equal(data, result, check_dtype=False)
  File "/«BUILDDIR»/pandas-0.14.0+git17-g3849d5d/debian/tmp/usr/lib/python2.7/dist-packages/pandas/util/testing.py", line 563, in assert_frame_equal
    assert_index_equal(left.columns, right.columns)
  File "/«BUILDDIR»/pandas-0.14.0+git17-g3849d5d/debian/tmp/usr/lib/python2.7/dist-packages/pandas/util/testing.py", line 501, in assert_index_equal
    right.dtype))
AssertionError: [index] left [object Index([u'9da8bYrdhD', u'h4CraEsPjW', u'N0bmM7oPk7'], dtype='object')], right [Index([u'a', u'b', u'c'], dtype='object') object]

======================================================================
FAIL: test_round_trip_frame_string (pandas.io.tests.test_clipboard.TestClipboard)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/«BUILDDIR»/pandas-0.14.0+git17-g3849d5d/debian/tmp/usr/lib/python2.7/dist-packages/pandas/io/tests/test_clipboard.py", line 65, in test_round_trip_frame_string
    self.check_round_trip_frame(dt,excel=False)
  File "/«BUILDDIR»/pandas-0.14.0+git17-g3849d5d/debian/tmp/usr/lib/python2.7/dist-packages/pandas/io/tests/test_clipboard.py", line 57, in check_round_trip_frame
    tm.assert_frame_equal(data, result, check_dtype=False)
  File "/«BUILDDIR»/pandas-0.14.0+git17-g3849d5d/debian/tmp/usr/lib/python2.7/dist-packages/pandas/util/testing.py", line 563, in assert_frame_equal
    assert_index_equal(left.columns, right.columns)
  File "/«BUILDDIR»/pandas-0.14.0+git17-g3849d5d/debian/tmp/usr/lib/python2.7/dist-packages/pandas/util/testing.py", line 501, in assert_index_equal
    right.dtype))
AssertionError: [index] left [object Index([u'9da8bYrdhD', u'h4CraEsPjW', u'N0bmM7oPk7'], dtype='object')], right [Index([u'a', u'b', u'c'], dtype='object') object]

----------------------------------------------------------------------
Ran 7157 tests in 763.157s

FAILED (SKIP=247, errors=1, failures=3)
```
