Pull recent changes from SVN trunk (also tagged DCubeClient-00-00-52)

Updates from ChangeLog:

2017-07-10  Tim Adye  <T.J.Adye@rl.ac.uk>
	* Add support for TEfficiency plots (plotted as "graph" type)
	* fix graph statistics display and show y-mean/RMS instead of x-mean/RMS for 1D
	* don't crash on empty graph
	* graph plot style more like hist1d (red full circle, full-size plot, better ranges)
	M       python/DCubeConfig.py
	M       python/DCubeTester.py
	M       python/DCubePlotter.py

2017-03-26   Peter Sherwood  <peter@MacBook-Pro-7.fritz.box>
	* share/DCubeValid.xml: added new branch regex fo NN.N (eg 21.0)
	new cmtconfigs x86_64-slc6-gcc62-(opt, dev), new project Athena

2016-04-09  Atlas-Validation Runtimetester  <rtt@lxplus0003.cern.ch>
	* Tagging DCubeClient-00-00-51
	* Python 2.7.10 and ROOT 6.06/02 version update in dev nightly branch
	breaks the code to fetch histograms from a TFile instance, as the TFile.Get()
	function no longer accepts a unicode path, it needs ascii. Fixed by
	converting path to path.encode('ascii', 'ignore').

	M       python/DCubeTester.py
	M       python/DCubeApp.py


Former-commit-id: e45e8ee6