boot-floppies, rewrite of help screens

[Marc Singer <elf@master.debian.org>]

I spent some time rewriting the help screens for the rescue disk to
make them more comprehensible and to add information about using the
rescue disk to rescue a system.  I put the patch on master

  //master.debian.org/~elf/patches/boot-floppies_2.0.11_p1

Comments?