Ignore CVS directories when building documentation

[Igor Peshansky <pechtcha at cs dot nyu dot edu>]

The doctool program recursively searches for SGML/XML chunks in
subdirectories.  CVS keeps base copies of "cvs edit"ed files in CVS/Base.
Including both the base copy and the modified file results in duplicate
ids and other validation errors (not to mention wrong output).  This patch
tells doctool to ignore CVS directories during recursive traversals.

As usual, the ChangeLog is below.
	Igor
==============================================================================
2006-01-11  Igor Peshansky  <pechtcha@cs.nyu.edu>

	* doctool.c (scan_directory): Ignore "CVS" directories.

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