GTSAM commit history missing

[YoshuaNava]

Dear developers,
Thank you for sharing this piece of work. It looks quite interesting.

I just wanted to give my feedback on the absence of the gtsam commit history. I think that it would have been beneficial to include the full gtsam commit history, such that the changes you made to the library can be directly tracked, and if the authors or someone wants to push your contributions to the upstream gtsam repo, it's easier for them.

Best,
Yoshua Nava