v1.4.13 - multiple enhancements and fixes

1.4.13 Syncoid will now continue trying to replicate other child datasets after one dataset fails replication
when called recursively. Eg syncoid -r source/parent target/parent when source/parent/child1 has been
deleted and replaced with an imposter will no longer prevent source/parent/child2 from successfully
replicating to target/parent/child2. This could still use some cleanup TBH; syncoid SHOULD exit 3
if any of these errors happen (to assist detection of errors in scripting) but now would exit 0.

1.4.12 Sanoid now strips trailing whitespace in template definitions in sanoid.conf, per Github #61

1.4.11 enhanced Syncoid to use zfs guid property rather than creation property to ensure snapshots on source and target actually match. This immediately prevents conflicts due to timezone differences on source and target, and also paves the way in the future for Syncoid to find matching snapshots even after zfs rename on source or target. Thank you Github user @mailinglists35 for the idea!

1.4.10 added --compress=pigz-fast and --compress=pigz-slow. On a Xeon E3-1231v3, pigz-fast is equivalent compression to --compress=gzip but with compressed throughput of 75.2 MiB/s instead of 18.1 MiB/s. pigz-slow is around 5% better compression than compress=gzip with roughly equivalent compressed throughput. Note that pigz-fast produces a whopping 20+% better compression on the test data (a linux boot drive) than lzop does, while still being fast enough to saturate or nearly saturate a real-world gigabit LAN link. The down side: pigz chews through 100% util of all available system threads, if not bottlenecked by the network link speed.