[Kst] [Kst-plot/kst] 3b03a1: Add filtering to the data manager.

[Nicolas Brisset]

  Branch: refs/heads/master
  Home:   https://github.com/Kst-plot/kst
  Commit: 3b03a143882ad99d0aeec6f77063e3ca5bd00d00
      https://github.com/Kst-plot/kst/commit/3b03a143882ad99d0aeec6f77063e3ca5bd00d00
  Author: Nicolas Brisset <nicolas.brisset at free.fr>
  Date:   2013-10-23 (Wed, 23 Oct 2013)

  Changed paths:
    M src/libkstapp/datamanager.cpp
    M src/libkstapp/datamanager.h
    M src/libkstapp/datamanager.ui

  Log Message:
  -----------
  Add filtering to the data manager.
I thought it would be more difficult, but it turns out that Qt is really great and it was actually quite easy.
There is however a potential for crashes. I think I handled everything but a thorough code review and some testing would be
really appreaciated!