add logo to overview
add dif plot graph
Fix build with old boost versions
Merge branch 'master' of https://github.com/palmd/spreadcoin into palmd-master
Some cleanups
Remove printer
Remove unused defines
Add checkpoint
Vesrion 0.9.15
Merge branch 'master' into cpuminer1.2
Update depends
Fix gitian build
Merge branch 'master' into cpuminer1.2

Conflicts:
	contrib/gitian-descriptors/linux/gitian-linux-darkcoin.yml
	contrib/gitian-descriptors/windows/gitian-win-darkcoin.yml