Copy spatial_partitions when copying GeoDataFrame

[DahnJ]

Creates a copy() method that copies spatial_partitions, as discussed in #55

[jorisvandenbossche]

Thanks, looks good!

[jorisvandenbossche]

@DahnJ BTW, looking at the git history in this PR, you probably want to "clean up" your local master branch (it seems to include commits / merges from earlier PRs).
For this PR it doesn't matter much (since I squashed all commits while merging anyway), but it will probably make your development / next PRs a bit easier.

[DahnJ]

@DahnJ BTW, looking at the git history in this PR, you probably want to "clean up" your local master branch (it seems to include commits / merges from earlier PRs).

Yes, you're right, I'm not sure how to "clean up" though. What operation should I perform?

[jorisvandenbossche]

If there are no other commits on your master branch that you still want to keep / make a PR from, then you could do a full "reset" of your local master branch with upstream master (assuming this repo is called upstream, and your fork origin):

git fetch upstream
git checkout master
git reset --hard upstream/master

After that, it's best to always ensure to commit your work in a new branch, and not in the master branch. And then you can keep your local master branch updated with upstream's master.