HIS is the story of the honourable birth, unsuccessful life, and present coma (it may not yet be death) of an originally admirable political spoof word. I say "admirable," because the popularization of the possibly meaningless word "planning" in Britain's political vocabulary in the dear, dead 1960's did not start as the result of an attempt by politicians to fool the people. It started as the result of an attempt by economic writers to fool politicians in a good cause.