tweaks

README.md

@@ -89,6 +89,7 @@ In the following, we assume a Debian-based distribution. For other
 distributions, the "apt" lines will need slight changes.
 
 NIFTy4 and its mandatory dependencies can be installed via:
+
     sudo apt-get install git libfftw3-dev python  python-pip  python-dev
     pip install --user git+https://gitlab.mpcdf.mpg.de/ift/NIFTy.git@NIFTy_4
 
@@ -98,16 +99,20 @@ an incorrectly configured pyFFTW package, which does not cooperate with the
 installed FFTW3 libraries)
 
 Plotting support is added via:
+
     pip install --user matplotlib
 
 Support for spherical harmonic transforms is added via:
+
     pip install --user git+https://gitlab.mpcdf.mpg.de/ift/pyHealpix.git
 
 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