Embed signature in cython function docstrings

  modified:   cmake/FindCythonModuleMacro.cmake
Fix small issues with new GF

  modified:   pytriqs/base/gf/local/descriptors.py
  modified:   pytriqs/base/gf/local/gf_generic.py
  modified:   pytriqs/base/gf/local/gf_generic.pyx
  modified:   pytriqs/base/gf/local/gf_imfreq.py
  modified:   pytriqs/base/gf/local/gf_imtime.py
  modified:   pytriqs/base/gf/local/gf_legendre.py
  modified:   pytriqs/base/gf/local/gf_refreq.py
  modified:   pytriqs/base/gf/local/gf_retime.py
  modified:   pytriqs/base/gf/local/impl_plot.py
  modified:   pytriqs/base/gf/local/nothing.py
  modified:   pytriqs/base/gf/local/refreq.pyx
Adapt user manual to new GF

Transfer to the new GF is quite OK. Still missing is:

* GfReTime
* Fourier transforms between GfReTime and GfReFreq
* Methods density for GfReFreq
* Pade

  modified:   doc/user_manual/data_analysis/fit/demo1.py
  modified:   doc/user_manual/data_analysis/fit/demo1_prepare.py
  modified:   doc/user_manual/data_analysis/hdf5/tut_ex2.py
  modified:   doc/user_manual/data_analysis/hdf5/tut_ex2b.py
  modified:   doc/user_manual/data_analysis/hdf5/tut_ex3.py
  modified:   doc/user_manual/data_analysis/hdf5/tut_ex3b.py
  modified:   doc/user_manual/data_analysis/plotting/example.py
  modified:   doc/user_manual/green/block.rst
  modified:   doc/user_manual/green/block/GfImFreq.rst
  modified:   doc/user_manual/green/block/GfImTime.rst
  modified:   doc/user_manual/green/block/GfLegendre.rst
  modified:   doc/user_manual/green/block/GfReFreq.rst
  modified:   doc/user_manual/green/block/GfReTime.rst
  modified:   doc/user_manual/green/block/green_imfreq.py
  modified:   doc/user_manual/green/block/green_imtime.py
  renamed:    doc/user_manual/green/block/green_imlegendre.py -> doc/user_manual/green/block/green_legendre.py
  modified:   doc/user_manual/green/block/green_pade.py
  modified:   doc/user_manual/green/block/green_refreq.py
  modified:   doc/user_manual/green/block/green_retime.py
  modified:   doc/user_manual/green/descriptors.rst
  modified:   doc/user_manual/green/example.py
  modified:   doc/user_manual/green/fourier.py
  modified:   doc/user_manual/green/full.rst
  modified:   doc/user_manual/green/green.rst
  modified:   doc/user_manual/green/impinbath.py
  modified:   doc/user_manual/green/legendre.py
  modified:   doc/user_manual/install/install.rst
  modified:   doc/user_manual/install/install_options.rst
  modified:   doc/user_manual/introduction/tour1.rst
  modified:   doc/user_manual/lattice/ex_Hilbert.py
  modified:   doc/user_manual/solvers/aim.py
  modified:   doc/user_manual/solvers/aim_plot.py
  modified:   doc/user_manual/solvers/dmft/plot.py
  modified:   doc/user_manual/solvers/dmft/single_site_bethe.h5
  modified:   doc/user_manual/solvers/dmft/single_site_bethe.py
  modified:   doc/user_manual/solvers/ipt/ipt.py
  modified:   doc/user_manual/solvers/ipt/mott.py
  modified:   doc/user_manual/solvers/legendre_plot.py
  modified:   doc/user_manual/solvers/several_random.py
  modified:   doc/user_manual/solvers/solution.h5
  modified:   doc/user_manual/wien2k/advanced.rst