Update checkpoints.cpp

Add new checkpoints
Update db.cpp

Add FastStart
Update init.cpp

Add FastStart
Update main.h

Add FastStart
Update bitcoingui.cpp

Fix the "For staking only" option.
Update bitcoingui.h

Fix the "For staking only" option.
Update walletmodel.cpp

Fix the "For staking only" option.
Update version.h

Checkpoints, FastStart & bug fix for Staking Only option.
Merge pull request #7 from kryptkoin/KTKupdates

KTKupdates