Fix #51

- The kind() method of mesh should return a char,
like the parameter of the constructor of mesh,
not the C++ corresponding int.
- otherwise, the reduction - construction is broken
and by extension all pickling and then all mpi constructions.

pytriqs/gf/local/mesh_imtime.pyx

@@ -12,7 +12,7 @@ cdef class MeshImTime:
 
     property kind : 
         """Inverse temperature"""
-        def __get__(self): return self._c.kind()
+        def __get__(self): return {half_bins: 'H', full_bins: 'F', without_last: 'W'}[self._c.kind()]
     
     property statistic : 
         def __get__(self): return 'F' if self._c.domain().statistic==Fermion else 'B'

pytriqs/gf/local/mesh_refreq.pyx

@@ -11,7 +11,7 @@ cdef class MeshReFreq:
         def __get__(self): return self._c.x_max()
 
     property kind:
-        def __get__(self): return self._c.kind()
+        def __get__(self): return {half_bins: 'H', full_bins: 'F', without_last: 'W'}[self._c.kind()]
 
     def __len__ (self) : return self._c.size()
     

pytriqs/gf/local/mesh_retime.pyx

@@ -11,7 +11,7 @@ cdef class MeshReTime:
         def __get__(self): return self._c.x_max()
 
     property kind:
-        def __get__(self): return self._c.kind()
+        def __get__(self): return {half_bins: 'H', full_bins: 'F', without_last: 'W'}[self._c.kind()]
 
     def __len__ (self) : return self._c.size()
     

pytriqs/gf/local/refreq.pxd

@@ -10,7 +10,7 @@ cdef extern from "triqs/gfs/refreq.hpp" namespace "triqs::gfs" :
         double x_min()
         double x_max()
         long size()
-        double kind()
+        long kind()
         bint operator ==( mesh_refreq &)
 
     cdef mesh_refreq make_mesh_refreq "triqs::gfs::gf_mesh<triqs::gfs::refreq>" (double omega_min, double omega_max, size_t n_freq, mesh_enum mk)

pytriqs/gf/local/retime.pxd

@@ -10,7 +10,7 @@ cdef extern from "triqs/gfs/retime.hpp" namespace "triqs::gfs" :
         double x_min()
         double x_max()
         long size()
-        double kind()
+        long kind()
         bint operator ==( mesh_retime &)
 
     cdef mesh_retime make_mesh_retime  "triqs::gfs::gf_mesh<triqs::gfs::retime>" (double t_min, double t_max, size_t n_freq, mesh_enum mk)