DOC: enhance license text for SuperBuild & packages

SuperBuild/Copyright/LICENSE

+This package is made of several open source components. Each one of the
+components present in this package is licensed under the terms specified by the
+authors of that component.
+
 The OTB is released under the CeCILL-2.0 license. This license is available
 online :
   http://www.cecill.info/licences/Licence_CeCILL_V2-en.html
   http://www.cecill.info/licences/Licence_CeCILL_V2-fr.html
 
-However this binary package may be compiled with dependencies that have
-incompatible licensing. As a consequence, this OTB binary package will be
+However this package may be compiled with dependencies that have
+incompatible licensing. As a consequence, the OTB binaries will be
 released under GPL-v2 license in the following cases :
 - if ITK (used by OTB) was built with FFTW support enabled (FFTW is released
 under GPL-v2 license)