streamline description

README

-Kwant is a Python package for numerical quantum transport calculations. It aims
-to be an user-friendly, universal, and high-performance toolbox for the
-simulation of physical systems of any dimensionality and geometry that can be
-described by a tight-binding model. Kwant has been designed such that the
-natural concepts of the theory of quantum transport (lattices, symmetries,
-electrodes, orbital/spin/electron-hole degrees of freedom) are exposed in a
-simple and transparent way: Defining a new simulation setup is very close to
-describing the corresponding mathematical model. Kwant offers direct support for
-calculations of transport properties (conductance, noise, scattering matrix),
-dispersion relations, modes, wave functions, various Green’s functions, and
-out-of-equilibrium local quantities (charge or current densities). Other
-computations involving tight-binding Hamiltonians can be implemented easily
-thanks to its extensible and modular nature.
+Kwant is a Python package for numerical quantum transport calculations. It
+exposes the natural concepts of the theory of quantum transport (lattices,
+symmetries, electrodes, orbital/spin/electron-hole degrees of freedom) in a
+simple and transparent way. Kwant offers direct support for calculations of
+transport properties (conductance, noise, scattering matrix), dispersion
+relations, modes, wave functions, various Green’s functions, and
+out-of-equilibrium local quantities. Other computations involving tight-binding
+Hamiltonians can be implemented easily.
 
 See also the files INSTALL, LICENSE, AUTHORS, and ACKNOWLEDGEMENTS in this
 directory.

setup.py

@@ -440,7 +440,7 @@ def main():
           version=version(),
           author='C. W. Groth, M. Wimmer, A. R. Akhmerov, X. Waintal, et al.',
           author_email='authors@kwant-project.org',
-          description="A package for numerical quantum transport calculations.",
+          description="Package for numerical quantum transport calculations.",
           long_description=long_description(),
           platforms=["Unix", "Linux", "Mac OS-X", "Windows"],
           url="http://kwant-project.org/",