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Base classes for creating commands and syntax version object.

This module exports several important base classes:

    BaseData - The base abstract class for all data objects.  Data objects
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    BaseHandler - The base abstract class from which versioned kickstart
                  handler are derived.  Subclasses of BaseHandler hold
                  BaseData and KickstartCommand objects.

    DeprecatedCommand - An abstract subclass of KickstartCommand that should
                        be further subclassed by users of this module.  When
                        a subclass is used, a warning message will be
                        printed.

    KickstartCommand - The base abstract class for all kickstart commands.
                       Command objects are contained within a BaseHandler
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           currentLine   -- The current unprocessed line from the input file
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           handler       -- A reference to the BaseHandler subclass this
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           lineno        -- The current line number in the input file.
           seen          -- If this command was ever used in the kickstart file,
                            this attribute will be set to True.  This allows
                            for differentiating commands that were omitted
                            from those that default to unset.
           writePriority -- An integer specifying when this command should be
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           dataUpdates      -- This is the same as commandUpdates, but for
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           Instance attributes:

           packages -- An instance of pykickstart.parser.Packages which
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           platform -- A string describing the hardware platform, which is
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