Bug#858727: h5py: Missing install dependency on numpy-dbg

[Ghislain Antony Vaillant]

Source: h5py
Severity: important

The h5py debug packages are missing an install dependency on their
corresponding numpy-dbg package. This can be verified by running the
as-installed test suite of the package, which yields the following
ImportError:

```
File "/usr/lib/python2.7/dist-packages/numpy/core/__init__.py", line 24,
in <module>
    raise ImportError(msg)
ImportError: 
Importing the multiarray numpy extension module failed.  Most likely you
are trying to import a failed build of numpy. If you're working with a
numpy git repo, try `git clean -xdf` (removes all files not under
version control).  Otherwise reinstall numpy.
```

-- System Information:
Debian Release: 9.0
  APT prefers unstable
  APT policy: (500, 'unstable'), (500, 'testing'), (1, 'experimental')
Architecture: amd64 (x86_64)

Kernel: Linux 4.9.0-2-amd64 (SMP w/8 CPU cores)
Locale: LANG=en_GB.UTF-8, LC_CTYPE=en_GB.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)