Consistency and robustness improvements in mda:

- Introduce a mda_getlastline function(); improve the code to avoid
  useless allocations and string formatting; make it return the last
  line with content (skip trailing empty lines if found).
- Add a mechanism by which the mda can request the parent to abort a
  local delivery by killing the process.
- Use ioev/iobuf for draining data to the delivery process.
- Make sure to catch all transient errors and make them result in a
  tempfail rather than calling fatal().
- Make sure that the envelope status is properly set for all failures.
- Stop using SMTP response codes; it makes no sense in this context.

ok gilles@

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