Check to see if the given path is valid
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 Syntax

        GT_IsPath( cPath )

 Arguments:

      cPath - Path to consider

 Returns:

      .T. if path is valid
      .F. otherwise

 Description:

       Checks that all of the characters appearing in the string are valid
       for a DOS path

 Examples:



 Source: DOSPATH.PRG

 Author:  Martin Colloby