copyright year in version output should be automatic

[Peter Johansson]

refs #218

Following GNU standard, the second line in --versionoutput looks like

Copyright (C) 2007 Jari Häkkinen and Peter Johansson

This information could easily be parsed from svn into a header file (included in a dist). The year, 2007, is the year of last commitment.

The list of authors could of course be parsed from svn as well, but for time being I consider this list to be static.

Just like in ticket:218 the generated header file should not be touched unless it is necessary. After all the copyright year is only updated (at most) once a year.

[Peter Johansson]

Fixed in r540