StartWithdrawal now persists the WithdrawalStatus before returning, and also
returns a previously saved one in subsequent calls with the same parameters.
This introduce a new internal package to deal with the explicit
clearing of data (such as private keys) in byte slices, byte arrays
(32 and 64-bytes long), and multi-precision "big" integers.
Benchmarks from a xeon e3 (Xor is the zeroing funcion which Bytes
replaces):
BenchmarkXor32 30000000 52.1 ns/op
BenchmarkXor64 20000000 91.5 ns/op
BenchmarkRange32 50000000 31.8 ns/op
BenchmarkRange64 30000000 49.5 ns/op
BenchmarkBytes32 200000000 10.1 ns/op
BenchmarkBytes64 100000000 15.4 ns/op
BenchmarkBytea32 1000000000 2.24 ns/op
BenchmarkBytea64 300000000 4.46 ns/op
Removes an XXX from the votingpool package.
This contains the APIs to create and retrieve Voting Pools and Series (with
public/private keys) from a walletdb namespace, plus the generation of deposit
addresses (using m-of-n multi-sig P2SH scripts according to the series
configuration).
