Remove no-op

This expression is not assigned to no variable, and so has no effect.
Pass CC/CFLAGS and CC/CXXFLAGS to configure script separately

Addresses #158.
Merge pull request #159 from lpsinger/cflags-parsing

Pass CC/CFLAGS and CC/CXXFLAGS to configure script separately
Release 1.7.4
Update MANIFEST.in

Added CITATION to tarball Closes #165
Implementation of map2alm_spin
Implementation of alm2map_spin
Import alm2map_spin,map2alm_spin in base namespace
Order of the arguments was wrong
reimplementation of angdist
Doctest for angdist
Merge pull request #166 from zonca/angdist

angdist function needs improvements
map2alm_spin and alm2map_spin unit tests

Implemented by Duncan Hanson
* Compare spin-1 alm2map transform to alm2map_der1
* Compare spin-1,2,3 alm2map and map2alm transforms to precomputed
  values for small lmax,nside and spins=1,2,3.
* Compare forward and backward transforms (not very stringent,
  they only agree to ~1.e-2, because healpix is not complete basis).
Restored spin0 test
Fix for spin0

The C++ code assumes arrays are initialized to zero.
Merge pull request #76 from zonca/alm2map_spin

implement alm2map_spin and map2alm_spin
Fix in ud_grade docs
State the ordering of alms in write_alms
Warning that map mean is being removed

Previously regression=True was not actually working, so
better at least warn users now.
Closes #167
Correct Cython dependency