Merge branch 'utils' of http://gnuradio.org/git/trondeau into master

* 'utils' of http://gnuradio.org/git/trondeau:
  Fixed slider behavior when the end of the file is reached.
  Handling a few exceptions when no file is loaded.
  Can now change the size of the symbols. Also fixes some layout issues.
  Adding ability to change line width and style (only a handful of current styles enabled).
  Removing plot picker that addd nothing to the interface.
  Adding a Reload option (Ctrl+R) option to quickly reread the file and reset the state.