[Kst] [Kst-plot/kst] 16d4ae: Fix some qreal issues.

[Barth Netterfield]

  Branch: refs/heads/master
  Home:   https://github.com/Kst-plot/kst
  Commit: 16d4aea302e9f9eeca86e3ad72f448b8303d31b5
      https://github.com/Kst-plot/kst/commit/16d4aea302e9f9eeca86e3ad72f448b8303d31b5
  Author: Barth Netterfield <netterfield at astro.utoronto.ca>
  Date:   2015-01-11 (Sun, 11 Jan 2015)

  Changed paths:
    M src/libkst/editablevector.cpp
    M src/libkst/vector.cpp
    M src/libkstmath/curve.cpp
    M src/plugins/dataobject/activitylevel/activitylevel.cpp

  Log Message:
  -----------
  Fix some qreal issues.

CCBUG: 342642

floating point values which count pixels or screen locations
can and should be qreal.

floating point values which are
involved with computational manipulation of the data
should be double, even though this is slower in ARM.

They shouldn't mix if it can be helped.