Update copyrights where my email appears with the new one.

libavfilter/af_pan.c

 /*
  * Copyright (c) 2002 Anders Johansson <ajh@atri.curtin.edu.au>
- * Copyright (c) 2011 Clément Bœsch <ubitux@gmail.com>
+ * Copyright (c) 2011 Clément Bœsch <u pkh me>
  * Copyright (c) 2011 Nicolas George <nicolas.george@normalesup.org>
  *
  * This file is part of FFmpeg.

libavfilter/af_silencedetect.c

 /*
- * Copyright (c) 2012 Clément Bœsch <ubitux@gmail.com>
+ * Copyright (c) 2012 Clément Bœsch <u pkh me>
  *
  * This file is part of FFmpeg.
  *

libavfilter/vf_geq.c

 /*
  * Copyright (C) 2006 Michael Niedermayer <michaelni@gmx.at>
- * Copyright (C) 2012 Clément Bœsch <ubitux@gmail.com>
+ * Copyright (C) 2012 Clément Bœsch <u pkh me>
  *
  * This file is part of FFmpeg.
  *

libavfilter/vf_owdenoise.c

 /*
  * Copyright (c) 2007 Michael Niedermayer <michaelni@gmx.at>
- * Copyright (c) 2013 Clément Bœsch <ubitux@gmail.com>
+ * Copyright (c) 2013 Clément Bœsch <u pkh me>
  *
  * This file is part of FFmpeg.
  *

libavfilter/vf_spp.c

 /*
  * Copyright (c) 2003 Michael Niedermayer <michaelni@gmx.at>
- * Copyright (c) 2013 Clément Bœsch <ubitux@gmail.com>
+ * Copyright (c) 2013 Clément Bœsch <u pkh me>
  *
  * This file is part of FFmpeg.
  *

libavformat/microdvddec.c

 /*
  * MicroDVD subtitle demuxer
  * Copyright (c) 2010  Aurelien Jacobs <aurel@gnuage.org>
- * Copyright (c) 2012  Clément Bœsch <ubitux@gmail.com>
+ * Copyright (c) 2012  Clément Bœsch <u pkh me>
  *
  * This file is part of FFmpeg.
  *