DataManager transfer multiple accounts in one request. However different vaults many transfer different accounts to the same destination. This requires the receiving side resolves at action level instead of request level
during account transafer : insert a new account or insert an entry of an account
resovle at action level and avoiding multiple transfer
avoid the situation that metadata is not populated during account transfer
Disable Integrity Check in DataManager for data stored in PmidNode
TODO for Disabling Integrity Check in DM
minor log message update
avoid using std::call_once
additional guard for the situation routing_ is not initialised
Merge branch 'account_transfer_demo' into next

Conflicts:
	src/maidsafe/vault/account_transfer.h
	src/maidsafe/vault/maid_manager/service.cc
	src/maidsafe/vault/vault.cc