bitshares-2

Merge pull request #249 from elmato/no-spam-sub-function

Move notification related functions from db_block.cpp to db_notify.cpp

debug_witness: Handle new params in changed/remove signals from database

Keep track of subscribed accounts and check for events that reference them

Include information of impacted accounts relative to the objects created/changed/removed. Only extract the impacted accounts information if there are handlers defined in order prevent useless cpu usage on nodes not exposing the rpc api