Complex Multigeom v2

[zjiang0529]

Hello,

We hope that this time the branch is rebased properly to your repository.
Thank you.

[mtezzele]

Unfortunately it is not. See https://github.com/mathLab/PyGeM/network.
I suggest you to start from the master branch
git checkout -b new_branch_name
then you add all the new code to the new_branch_name branch and then open a new PR with that branch.