MFp4:

- Fix for good (I hope) force-stopping mirrors and some filure cases
  (e.g. the last good component dies when synchronization is in progress).
  Don't use ->nstart/->nend consumer's fields, as this could be racy,
  because those fields are used in g_down/g_up, use ->index consumer's
  field instead for tracking number of not finished requests.

  Reported by:	marcel

- After 5 seconds of idle time (this should be configurable) mark all
  dirty providers as clean, so when mirror is not used in 5 seconds
  and there will be power failure, no synchronization on boot is needed.

  Idea from:	sorry, I can't find who suggested this

- When there are no ACTIVE components and no NEW components destroy whole
  mirror, not only provider.

- Fix one debug to show information about I/O request, before we change
  its command.

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