Add -f/force option to launcher and default to false.
Add -f/force option to launcher and default to false.

Launcher now requires a command line option to overwrite configuration
files and erase the blockchain, both locally and remotely.  Also fix
serialization/deserialization of testnet_def structure.

EOSIO/eos,EOSIO/eos,EOSIO/eos,EOSIO/eos,EOSIO/eos