First of all, 'c++/plovasp/atm' was erroneously removed after
the last merge with the upstream branch.
Now, the whole subdirectory 'c++' is added.
Also, C++ flags are properly imported from the TRIQS configuration.
In order to wrap the ATM routines by Python using TRIQS wrapping
tools it is necessary to modify the interface to 'dos_tetra3d'.
The major changes involved replacing direct NumPy arrays with
TRIQS arrays which can be converted to Python arrays using library
tools.
Also, some small changes were necessary to port the functions
from C99 complex numbers to C++ style.
CMakeList is added to automatize building of the ATM library.
In order to use c++2py tools the C-code must be rewritten to C++.
In particular, instead of direct creation of Numpy arrays STL
containers must be used.
