Automatically disable extended float support if a buggy version of HDF5 is detected
Update the release notes
Typo
Another typo
Renamed utility function from _broken_hdf5_extended_float to _broken_hdf5_long_double
Merge branch 'avalentino-check_hdf5_vs_gcc48_bug' into develop

Conflicts:
	RELEASE_NOTES.txt
Make nan types sort to the end.
Add a test for indexing columns containing a nan in the first row.
Update release notes for gh-282