Issue #1129 - Fix for Transaction Malleqbility

This patch creates a hard fork where signature format becomes far more
strict than SSL strictly allows.   It depends upon a recent update to FC
which allows optional strict checking of signatures.
checking for transaction uniqueness based upon timestamp and digest
Restore checkpoints
Disable unsupported operations
Bump chain db version
Duplicate transaction hardfork
Fix syncing due to withdraw types
Hack to fix wallet backups
Update checkpoint
Fix build
Update submodules