DOC: Use one column in the Doxygen alphabetical class index.
DOC: Use one column in the Doxygen alphabetical class index.

Some class names have become so long that the three columns
are counter-productive.  People are also confused with the
click on a letter in the index and do not see the entry that
is hidden to the right.

Change-Id: I34b9d90c5ff186cba31ece5f74f9cdd0db9f9931

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