python auto-adaptive possion cause a segmentation fault.

[Zongyuan Gu]

I have install fenics under ubuntu 12.04 64bit from ppa and the cpp version auto-adaptive possion demo works fine. But the python version cause a segmentation fault. (other python cases under demo also works fine.) After some debug and track, I found "solver = AdaptiveLinearVariationalSolver(problem, M)" will call "_fem.DofMap_swiginit(self,_fem.new_DofMap(*args))" in fem.py file line 656 and this will leads to a segmentation fault.

[Zongyuan Gu]

found it's ok when i use a clean ubuntu.