o When clearing a variable, do ``foo='', not ``foo=""'' to save 2 bytes.

  There are other places where double quotes are used unnecessarily as well
o Kill md_copy_kernel() and check_kernel() since the kernel is now a 'set'
o Add support for shell escapes from any prompt
o Consolidate post-install_sets sanity checks and put them in sane_install().
o install_sets() now calls sane_install() to do the sanity checks and won't
  let you continue until things are sane (as far as it can determine).

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