Quark 0.10.4.4

Recommended upgrade

Changes:

* Improved syncing
* Update checkpoints

https://github.com/quark-project/quark/releases/tag/v0.10.4.4

Due to the split between 0.9 and 0.10 there was a period of instability, but difficulty has now recovered to near pre-fork levels.

Hopefully we'll have some new pools soon.