[Kst-plot/kst] cd764e: Add printf style formatting to numbers in labels.

[Barth Netterfield]

  Branch: refs/heads/master
  Home:   https://github.com/Kst-plot/kst
  Commit: cd764efe9f8a5467543cb16ee25b2a07615bfd31
      https://github.com/Kst-plot/kst/commit/cd764efe9f8a5467543cb16ee25b2a07615bfd31
  Author: Barth Netterfield <netterfield at astro.utoronto.ca>
  Date:   2016-12-12 (Mon, 12 Dec 2016)

  Changed paths:
    M pyKst/pykst.py
    M src/libkstapp/labelrenderer.cpp
    M src/libkstmath/labelparser.cpp
    M src/libkstmath/labelparser.h
    M src/widgets/labelbuilder.cpp

  Log Message:
  -----------
  Add printf style formatting to numbers in labels.

The syntax is, for example [INDEX:First (X1)]{%.3E}