10-Nov-2014	Version 1.0:
		first release
12-Nov-2014 Version 1.1:
		* Added defintion of threshold value to input data
		* Manage Chi-square value (and Wald statistics) for expected values = 0
		* Added generation of graphs of order relations among works
		* Added warning in summary tables for number of cases too small (< MIN_SAMPLE_SIZE)
13-Nov-2014 Version 1.1.1:
		* Changed the value for extension of Chi-square and Wald in case of 0/0: now it returns 1
17-Nov-2014 Version 1.1.2:
		* Corrected missing output on the screen for fisher test progress
16-Feb-2015 Version 1.2:
		* Added generation of combined graphs with all criteria for each test performed
		* Added option N to show dotted lines in graphs
17-Feb-2015 Version 1.3:
		* Added option M to merge graphs from two tests

Usage requirements:
* Windows 64 bit system with Visual C++ redistributable packages for Visual Studio 2013
	- if not already installed: available free at
		http://www.microsoft.com/en-us/download/details.aspx?id=40784
* Suggested installation and use:
	- copy the executable in a new folder as you prefer
	- (optional): add the path of the folder to the PATH variable  with Control Panel -> System -> Advanced system settings -> Environment variables
	- create a folder for the output data
	- run Windows PowerShell
	- cd to the data folder
	- execute the command statling to get usage instructions (default command is statling -D)
* Graph output files use the dot language: 
	- you can use graphviz (or your package of choice) to analyse and render the graphs
	- graphviz is freely available at 
		http://www.graphviz.org/Download.php
	- acyclic.exe can be used to check if a graph defines a partial order relation or not
	- gvedit.exe can be used to view graphs and to export to image files