Clean up some LABS related code, remove un-used/needed stuff.

Adds actual working and feild tested wallet filter. Can set any amount 
of whitelist address's, in conf file or commandline args. 
fix daemon deadlock, when doing z_mergetoaddress and mining at same time 
(needs more testing on staking chains) 
Set z_mergtoaddress to use a 0 expiry height when not doing z-tx's. They 
were failing and peers were getting banned trying to broadcast them.

src/notaries_staked.h

@@ -119,7 +119,6 @@ static const char *notaries_STAKED[NUM_STAKED_ERAS][64][2] =
 
 int8_t is_STAKED(const char *chain_name);
 int32_t STAKED_era(int timestamp);
-int8_t updateStakedNotary();
 int8_t numStakedNotaries(uint8_t pubkeys[64][33],int8_t era);
 int8_t StakedNotaryID(std::string &notaryname, char *Raddress);
 void UpdateNotaryAddrs(uint8_t pubkeys[64][33],int8_t numNotaries);