C00: 1946-1948

Following up World Championship Qualifiers 1946, I added a new page, Zonals 1946-1948 (C00), to the index of World Chess Championship Zonals. Of course, the events on the 1946-1948 (C00) page weren't zonals -- I don't know when the term was first used -- but they were precursors of the qualifying events in the next cycle. If I ever get around to adding more clippings from the post-WWII period, I might rename the page 'Interregnum', which has become the standard term for the years between World Champions Alekhine and Botvinnik.