* editing the NPSimulation UI for nicer interface
 - adding menue and icon for common command
 - adding free icons for nice interface

* clean up the Physics list file (remove trailling comment and reindent)
* fix cout issue in event action

 - Put 2009-2013 copyright date
 - Change the place of the ifndef position to avoid multiple inclusion of comment line

 - Add associate class in NPL
 - Add Function in NPL

Some code clean up has been done as well (cosmetic change for the most)

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   - the output is now on a single line

* Add some documentation for Gaspard (not yet finished)

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