Code review comment for lp:~peppujols/stellarium/printsky

I was going to merge this into the trunk today, but then noticed that both of the files that contain the main class, PrintSky.hpp and PrintSky.cpp, are missing the GNU GPL header - the comment section in the beginning that indicates the license.
http://www.gnu.org/licenses/old-licenses/gpl-2.0.html#SEC4

Pep Pujols, could you please fix this? It needs to be done by the author of the code, to make clear that you are releasing them under this license.