Integrate ext2ed into the e2fsprogs build system, and make minimal changes so

Integrate ext2ed into the e2fsprogs build system, and make minimal changes so
that it will compile on modern systems.  The top-level makefile does not recurse
into the ext2ed directory for now, pending determination of whether the original
author is still maintaining ext2ed.

The documentation files have been renamed to remove the version from the filename.
In addition, the SGML files have been converted from LinuxDoc to DocBook.

The way root_bindir, root_sbindir, and root_libdir have been changed so that
if root_prefix is not set, the values set by the configure command-line options to
set the directory names using --bindir, --sbindir, --libdir will affect the
root_bindir, et.al Makefile variables.