-> Previously, calculation was implicitly assuming a mesh with only positive matsubara frequencies.
-> Added corresponding test
-> Also added test of density calculation with or without correct tail.
- the condition p%2 ==1 was wrong if p<0 (never true!)
- added corresponding test (gf_notail)
Conflicts:
triqs/gfs/imtime.hpp
Fixed by O.P. : already fixed in Laura's pull request ...