CLN: enforce four-space indentation

[dsm054]

Many files:

['./bench/bench_join_panel.py',
 './pandas/sandbox/qtpandas.py',
 './pandas/tests/test_common.py',
 './pandas/tests/test_frame.py',
 './pandas/tests/test_generic.py',
 './pandas/core/series.py',
 './pandas/core/format.py',
 './pandas/core/internals.py',
 './pandas/core/indexing.py',
 './pandas/io/tests/test_sql.py',
 './pandas/tseries/converter.py',
 './setup.py',
 './doc/make.py',
 './doc/sphinxext/numpydoc/docscrape.py',
 './doc/sphinxext/ipython_sphinxext/ipython_directive.py']

have indentation which isn't four-space. Sometimes it's consistently eight spaces:

def create_panels_append(cls, panels):
        """ return an append list of panels """
        panels = [a for a in panels if a is not None]
        # corner cases

and sometimes it's more inconsistent (5 here, but not elsewhere):

        with ensure_clean(pname) as path:

             self.frame['A'][:5] = nan

so that pylint spits out complaints like

W:5577,0: Bad indentation. Found 23 spaces, expected 20

There's also at least one rogue tab in testing.py:

    def assert_numpy_array_equal(self, np_array, assert_equal):
        if np.array_equal(np_array, assert_equal):
                return
        raise AssertionError('{0} is not equal to {1}.'.format(np_array, assert$

Easily fixed, although I wonder if it should be hooked to avoid it happening again.

[jreback]

seems reasonable
not sure what u mean by hook?

[dsm054]

I meant a git hook (although I've only ever used svn/hg ones myself).

[jreback]

never used one either
if u have time give a whirl see what happens

[jreback]

let's do this immediately after release of 0.14.0 / kind of like a pep storm