MFbed: Update the German Handbook.
share/sgml/mailing-lists.ent 1.24 -> 1.25
books/handbook/boot/chapter.sgml header update
books/handbook/ports/chapter.sgml 1.200 -> 1.205
books/handbook/cutting-edge/chapter.sgml 1.184 -> 1.187
books/handbook/mirrors/chapter.sgml 1.295 -> 1.320
books/handbook/serialcomms/chapter.sgml header update
books/handbook/l10n/chapter.sgml 1.89 -> 1.91
books/handbook/x11/chapter.sgml 1.119 -> 1.127
books/handbook/eresources/chapter.sgml 1.123 -> 1.128
books/handbook/pgpkeys/chapter.sgml 1.192 -> 1.196