Andrey Skvortsov <andrej.skvortzov@gmail.com> [Fri, 06 May 2016 16:16:30 +0300] rev 1513
add distribution license notice to about dialog as GPL requires
Andrey Skvortsov <andrej.skvortzov@gmail.com> [Fri, 06 May 2016 14:45:06 +0300] rev 1512
add GPLv2 license
Andrey Skvortsov <andrej.skvortzov@gmail.com> [Fri, 06 May 2016 14:05:44 +0300] rev 1511
add copyright notices to python files where there were missing, that
is required by GPLv2