Fix #22, but floating windows mess up ordering.

For reasons that should be obvious.
Merge branch 'develop' into numist/issue-22
Update WindowLevel filter to avoid forward-declaring private API

Because it's pretty brittle to do that.
Sort floating windows to the end of the list, pending fix to #25.

Because it's less annoying than having them at the beginning of the
list.
Whitespace
Fix #21
Fix #26
Merge branch 'numist/issue-22' into develop
Fixes #22
Chrome doesn't respond correctly to -raise, back out fix to #22

Might make it an option, but best not to expose anything that straight
up doesn't work.