[jsk_rqt_plugins/HistogramPlot] modify to correctly run on kinetic

[knorth55]

Kinetic uses qt5, and qt5 has different module structure.
I refactor codes and update to use correct module for kinetic.
You can check with

roslaunch jsk_perception sample_bof_object_recognition.launch
# or
roslaunch jsk_rqt_plugins sample_histogram.launch

[iory]

@k-okada
Related to #689 ,
An error occurs with kinetic if you not install matplotlib version (2.2.3). This is not apt version. apt version is 1.5.1

[k-okada]

@iroy do you men we should revert this? if so please add +1 to #704, and also please try to write the test code so that Travis find this error. I think just to write test script that import this file would be ok.

@knorth55 please rewrite the code with system matlab version for now. and if you can find the code to support both system (apt) version and pip version, then create new pull requests.

[knorth55]

@k-okada apt matplotlib have error with qt5 (see #688).
In order to prevent the error, we have to remove matplotlib dependency.

[knorth55]

or install matplotlib 2.0.0 with catkin_virtualenv.

[k-okada]

problem in #689? any way please look at https://github.com/ros-visualization/rqt_plot/blob/master/src/rqt_plot/data_plot/mat_data_plot.py#L54-L89 -- ◉ Kei Okada 2018年9月4日(火) 13:31 Shingo Kitagawa <notifications@github.com>:

…

or install matplotlib 2.0.0 with catkin_virtualenv. — You are receiving this because you were mentioned. Reply to this email directly, view it on GitHub <#688 (comment)>, or mute the thread <https://github.com/notifications/unsubscribe-auth/AAeG3MGsxhyuRsGRYd8gUsdCITDOxUbRks5uXgIjgaJpZM4SrekD> .

[knorth55]

@k-okada thank you, I found the solution.
I will make a PR for solving the problem.
https://github.com/ros-visualization/rqt_plot/blob/master/src/rqt_plot/data_plot/mat_data_plot.py#L62