v3.0-rc12

Changed in rc12:

• Snapshots will always be made, even if target host/dataset cant be contacted.
• Now usable as a snapshot tool, without needing to specify target-path.
• Can now destroy missing source-dataset on target (--destroy-missing)
• Also display dataset-name on stderr when there's an error.
• Closed all milestone issues of 3.0 release. This might be it the final v3.0 release :)

Recent changes in release candidates:

• Completed regression testing, fixes #49
• Added detection of pool features, and automatic resume support (--resume option not needed anymore)
• Removed soon to be deprecated zfs recv -D option.
• Various small fixes (stale filehandles etc)
• Fix: common snapshot could get deleted. (this happend due to a recent change in zfs-autobackup)
• Also thin out target-datasets that dont exist on the source anymore.
• Fix: Return correct error code, indicating the number of failed datasets.
• Fix: Flush all outputs to make sure stdout and stderr are synced.
• Automaticly enable --progress if output is a TTY.
• exposed --min-change value as a parameter. (was hardcoded at 200000)
• Issue #25, disable colors on non-tty
• added --no-send option. snapshots that are obsolete are now destroyed at the beginning of each dataset-transfer. this allows using --no-send as way to just thinout old snapshots. cleaned up stderr output when resuming.
• Added support for custom ssh client config
• Improved --rollback and incompatible snapshot detection. added --destroy-incompatible.
• --min-change is now has 1 instead of 200000 as default. fixes #37
• added thinner documentation and cleared up thinner output texts.