Fixed copyright clauses.

Checked that copyright notices are properly set up as according to:

http://www.gnu.org/licenses/gpl-howto.html

Corrected where they are not. Note that one or two-line fixes do not
count as copyrightable assets.

Additionally, fixed a minor indentation issue in chsmack.c.
Use strncpy() always copying labels.

Defence in depth and a good practice. Places an absolute limit
to the length copied.
Merge remote-tracking branch 'jarkkos/copyright-fix'
Merge remote-tracking branch 'jarkkos/strcpy-fix'