Move the filepointer n valid records from the current
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 Syntax

        GT_Skip([<bWhile>],[<bFor>],[<nRecords>],[<lEof>]) -> nMoved

 Arguments:

      <bWhile> Code block giving a while clause.

      <bFor> Code block giving a for clause.

      <nRecords> is the number of records to move down the
      file. Ie negative requires movement towards to
      begining of file.

 Returns:

      nMoved

 Description:

      Reposition the filepointer n valid records from the
      current.

 Examples:

 Source: GT_SKIP.PRG

 Author:  Martin Bryant