Merge the following from the English version:

1.20 -> 1.21 bibliography/chapter.sgml
1.39 -> 1.45 cutting-edge/chapter.sgml
1.26 -> 1.27 pgpkeys/chapter.sgml
1.23 -> 1.26 printing/chapter.sgml
1.15 -> 1.17 serialcomms/chapter.sgml

Submitted by: Shun SUZUKI <si006@ccm.gs.niigata-u.ac.jp>

		Hiroki Sato <hrs@geocities.co.jp>

Reviewed by: Hiroki Sato <hrs@geocities.co.jp>
References: [doc-jp 7425,7426]