[Kst-plot/kst] 8a16d6: Add hide_window() to pykst.

[Barth Netterfield]

  Branch: refs/heads/master
  Home:   https://github.com/Kst-plot/kst
  Commit: 8a16d66a01292acdb38e3ea7c965f13fb22ecbae
      https://github.com/Kst-plot/kst/commit/8a16d66a01292acdb38e3ea7c965f13fb22ecbae
  Author: Barth Netterfield <netterfield at astro.utoronto.ca>
  Date:   2016-08-22 (Mon, 22 Aug 2016)

  Changed paths:
    M pyKst/demo/dataobjects.py
    M pyKst/pykst.py
    M src/libkstapp/scriptserver.cpp
    M src/libkstapp/scriptserver.h

  Log Message:
  -----------
  Add hide_window() to pykst.

This completely hides the window which greatly speeds up
expensive plotting operations in pykst.