Get rid of the handler for the old default event color, as it is not needed here anymore.
Get rid of the handler for the old default event color, as it is not
needed here anymore.

Better algorithm for calculating a lighter color, works with black.

svn path=/trunk/kdepim/; revision=239005

lefou/kdepim-noakonadi,lefou/kdepim-noakonadi,lefou/kdepim-noakonadi,lefou/kdepim-noakonadi,lefou/kdepim-noakonadi,lefou/kdepim-noakonadi