stl_util.h: add find/find_if overloads for containers
stl_util.h: add find/find_if overloads for containers

svn path=/branches/kdepim/enterprise4/kdepim/; revision=1040704

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