Log Message:
memtester: update to 4.7.0. Changes:

- fix alignment issue causing crash when specifying a memory amount to
  test that is more than the minimum 1 page of memory, but less than 2
  full pages.
- add `-u` option to allow uncached memory semantics on some systems
  when using the -p option.
- fix manpage highlighting of args.
- add missing option documentation to man page.