qwtpolar: 1.1.0, new formula

Note that this is the [most recent 1.1.0-rc1 beta, in lieu of the current 1.0.1 stable](http://sourceforge.net/projects/qwtpolar/files/), which is not compatible with the current version of `qwt` (6.1) in Homebrew.
Maybe this should just go into `share` and be installed by default?