ENH: Updated copyright.

Source/kwsys/Base64.c

Source/kwsys/Base64.h.in

Source/kwsys/Configure.h.in

Source/kwsys/Configure.hxx.in

Source/kwsys/Copyright.txt

Source/kwsys/Directory.cxx

Source/kwsys/Directory.hxx.in

Source/kwsys/EncodeExecutable.c

Source/kwsys/Process.h.in

Source/kwsys/ProcessFwd9x.c

Source/kwsys/ProcessUNIX.c

Source/kwsys/ProcessWin32.c

Source/kwsys/RegularExpression.cxx

Source/kwsys/RegularExpression.hxx.in

Source/kwsys/SystemTools.cxx

Source/kwsys/SystemTools.hxx.in

Source/kwsys/kwsysHeaderDump.pl

Source/kwsys/kwsysPrivate.h

Source/kwsys/kwsys_std.h.in

Source/kwsys/kwsys_std_fstream.h.in