re-run clang-format, modify brace formatting

[stevengj]

Similar to #662:

Instructions for rebasing other branches after this PR:

Replace MYBRANCH below with the name of your branch:

# update repo
git checkout master && git pull origin master # update master

# switch to your branch
git checkout MYBRANCH

# rebase onto PREVIOUS commit
git rebase 72a3eeddf6d3a3e916c8e1603fa0fffe9d31cd29

# fetch the new .clang-format file
curl -o .clang-format https://raw.githubusercontent.com/NanoComp/meep/aa0b54b2a2c2984468469de390dd0537729ea68e/.clang-format

# reformat and rebase to THIS PR's commit
find . -name '*.*pp' | xargs clang-format -i
git commit -a -m "reformat"
git rebase -X theirs aa0b54b2a2c2984468469de390dd0537729ea68e

# finish rebase
git rebase master