document SciPy dependency, remove numpy dependency (since it is implied by SciPy)

Dockerfile

@@ -3,8 +3,8 @@ FROM debian:testing-slim
 RUN apt-get update
 
 # Debian package installations
-RUN apt-get install -y git libfftw3-dev openmpi-bin libopenmpi-dev python python-pip python-dev python-nose python-numpy python-matplotlib python-future python-mpi4py python-scipy
-RUN apt-get install -y python3 python3-pip python3-dev python3-nose python3-numpy python3-matplotlib python3-future python3-mpi4py python3-scipy
+RUN apt-get install -y git libfftw3-dev openmpi-bin libopenmpi-dev python python-pip python-dev python-nose python-matplotlib python-future python-mpi4py python-scipy
+RUN apt-get install -y python3 python3-pip python3-dev python3-nose python3-matplotlib python3-future python3-mpi4py python3-scipy
 RUN apt-get install -y python-sphinx python-sphinx-rtd-theme python-numpydoc
 
 # Python module installations

README.md

@@ -38,7 +38,7 @@ Installation
 ### Requirements
 
 - [Python](https://www.python.org/) (v2.7.x or 3.5.x)
-- [NumPy](https://www.numpy.org/)
+- [SciPy](https://www.scipy.org/)
 - [pyFFTW](https://pypi.python.org/pypi/pyFFTW)
 
 Optional dependencies:
@@ -46,7 +46,6 @@ Optional dependencies:
     transforms involving domains on the sphere)
 - [mpi4py](https://mpi4py.scipy.org) (for MPI-parallel execution)
 - [matplotlib](https://matplotlib.org/) (for field plotting)
-- [SciPy](https://www.scipy.org/) (for additional minimization algorithms)
 
 ### Sources
 
@@ -83,10 +82,6 @@ MPI support is added via:
     sudo apt-get install openmpi-bin libopenmpi-dev
     pip install --user mpi4py
 
-Scipy-based minimizers are enabled via:
-
-    pip install --user scipy
-
 ### Installation for Python 3
 
 If you want to run NIFTy with Python 3, you need to make the following changes

docs/source/installation.rst

@@ -28,10 +28,6 @@ MPI support is added via::
     sudo apt-get install openmpi-bin libopenmpi-dev
     pip install --user mpi4py
 
-Scipy-based minimizers are enabled via::
-
-    pip install --user scipy
-
 Installation for Python 3
 -------------------------
 
@@ -40,4 +36,3 @@ to the instructions above:
 
 - in all `apt-get` commands, replace `python-*` by `python3-*`
 - in all `pip` commands, replace `pip` by `pip3`
-

setup.py

@@ -40,8 +40,8 @@ setup(name="nifty4",
       packages=find_packages(include=["nifty4", "nifty4.*"]),
       zip_safe=True,
       license="GPLv3",
-      setup_requires=['future', 'numpy'],
-      install_requires=['future', 'numpy', 'pyfftw>=0.10.4'],
+      setup_requires=['future', 'scipy'],
+      install_requires=['future', 'scipy', 'pyfftw>=0.10.4'],
       classifiers=[
         "Development Status :: 4 - Beta",
         "Topic :: Utilities",