updating copyright stuff in slock as well

Added tag 0.6 for changeset dd226a81c09a

grab on the root window, it is correct, all lockers do that

Added tag 0.5 for changeset bd24ea7fcca2

grab on the slock window instead on the root window

made slock more readable, added root variable because we intend to call RootWindow(...) quite a lot

made slock more aggressive, DenisG please recheck

foobar

Added tag 0.4 for changeset 4c2cf4d6a2d0

fixed a potential buffer overflow bug on the stack (thanks to Ghassan Misherg)

thanks to Jack for this hint

fixed sizeof stuff

Added tag 0.3 for changeset f9157b1864388ad8f1920e5fde7c5849e73d8327

small fix of Vincent's patch

applied Vincent's path with some modifications

applied somwhat similiar patch like Alex Elide proposed

Added tag 0.2 for changeset da5cb1f0a685258d5315ea109860bacbc2871a57

added pointer grab

Added tag 0.1 for changeset 0a95c73c7374fbc2342b6040d9f35ddf597729e1

removed control mask handling for slock (quite useless in my eyes)