stream cleanups


git-svn-id: svn://svn.tuxfamily.org/svnroot/tesseract/main@1639 b412e182-2ed4-4078-95c4-27dc59f57fa9
streambuf cleanup


git-svn-id: svn://svn.tuxfamily.org/svnroot/tesseract/main@1640 b412e182-2ed4-4078-95c4-27dc59f57fa9
getstring/filtertext cleanup


git-svn-id: svn://svn.tuxfamily.org/svnroot/tesseract/main@1641 b412e182-2ed4-4078-95c4-27dc59f57fa9
listdir/listfiles cleanup


git-svn-id: svn://svn.tuxfamily.org/svnroot/tesseract/main@1642 b412e182-2ed4-4078-95c4-27dc59f57fa9