Remove operator test

It has been moved to the triqs library
Fix python solver test
Upgrade python part

It is updated to be compatible with the new 1.2 triqs library and
the new wrapper.
Get rid of many_body_operators

They have been moved to the triqs library
Remove c++ operator test

It is now in the triqs library
Reorganize c++ code for triqs 1.2

The c++ code has new constructors. It uses the new 1.2 parameter class.
gf_block_structure has been removed.
Move copying and license files to root
First iteration on c++ test upgrade