We will no longer break in the middle of words, only at whitespace or punctuation. This means we sometimes over-run, but that seems better than some of the bad splits we see. Closes #369
Set to false by default for now, since we are having a lot of problems with comments. We should set to true once we have a better algorithm.
With struct_lit_force_multiline set to true rustfmt won't ever mangle multiple struct properties into one line. Fixes #253