Default values for dropna to "False" (issue 9382)
As per discussion in Issue 9382, changes all HDF functions from having default of dropping all rows with NA in all non-index rows.

closes #9382

Followup for #9484

this will need to go into 0.17.0 as its a backward-incompatible change.
 Moved.

One question: I just noticed that saving an h5 file in the whatsnew file is creating an orphan file in the doc folder. Is there a standard way to deal with this? Should I import tempfile and use that? Delete after creation?
 search for suppress in io.rst to see how to do this
 Got it. Amended commit. Thanks!
 @jreback updated. 
 @nickeubank thanks. This is an API change so being deferred to 0.17.0. We are going to release 0.16.2 next week.
 Sounds good!

On Wed, Jun 3, 2015 at 11:27 AM jreback notifications@github.com wrote:

> @nickeubank https://github.com/nickeubank thanks. This is an API change
> so being deferred to 0.17.0. We are going to release 0.16.2 next week.
> 
> —
> Reply to this email directly or view it on GitHub
> https://github.com/pydata/pandas/pull/10097#issuecomment-108561769.
 status?
 @jreback rebased and read to go I think!
 @jreback thanks for comments. Think all updated now. 
 I also wanted to see an example with a panel (which was the original case here) 
 oh, ok. In the test, in io.rst, in whatsnew, or all of the above?
 test and io.rst. and put a link to the docs in whatsnew 
 @jreback  think we're good, though test_pytables is failing all over the place at the moment due to an apaprently change in array_to_datetime(). I get `TypeError: array_to_datetime() got an unexpected keyword argument 'require_iso8601'`
 you need to `make` as some cython code change
 Great! Thanks so much @jreback . All better. :)
 ok, minor correction, pls squash.

@jorisvandenbossche ?
 @jreback updated and squashed. Thanks. 
 Two more comments:
- it seems that dropna is not included in the `to_hdf` docstring?
- can you explicitly add how to restore the previous behaviour in the whatsnew file? (you said it in the docs, but I think it is important that this is also mentioned in the whatsnew)
 @jorisvandenbossche 
- added comments in what's new. 
- Not sure how to change to_hdf docstring. There's something doing on in the pytables.py table with docstrings I don't quite follow. Can you point me in the right direction?
 I think it's docstring is in core/generic.py or core/frame.py
 thanks @jorisvandenbossche , found it and amended the commit. 
 thanks @nickeubank 
