  * Allow environment override of more variables (including the new
    USE_UTF8 and IGNORE_?ID_*).
  * Support ~/.migrationtools.ph file overriding site defaults.
  * Offer to strip (as alternative to recode) unsupported characters.
  * Interactively ask about recoding/stripping (and only if needed).
  * Use prefix {md5} for passwords starting with $1$, and {CRYPT} only
    as fallback. Closes: bug#400343, thanks to Michael Burschik.
  * Use unusual object classes only optionally:
    - nisMailAlias (uses non-default misc schema)
    - krbPrincipalAux (uses non-default Kerberos schema)
    This closes bug#307616, thanks to gary ng.
