Added comments to wallet functions
working on dividing functions in prep for tx splitting
final changes to get transaction splitting building.  needs testing.
up tx splits limit 5 -> 30
added back successful tx message.  oops.
Added confirmation prompt if transactions are to be split
Transaction splitting *seems* to be working!!!
removed some debugging code (really stupid printf-style debuggng..
missed removing a debug print
removed erroneous printing of newlines
wallet RPC converted to use new transaction semantics

wallet RPC now uses wallet2::create_transactions and wallet2::commit_tx instead
of wallet2::transfer.  This made it possible to add the RPC call /transfer_split, which
will split transactions automatically if they are too large.  The old call to
/transfer will return an error stating to use /transfer_split if multiple
transactions are needed to fulfill the request.
needed to remove REQUIRED from find_package(Threads)
Remove unused array in cn_slow_hash
Explicit error constructors
Allow priority peers when there are exclusive peers

Per my reading this change makes sense since a subset of the exclusive
peers could be priority peers.  Priority peers that are not exclusive
will not get loaded, and priority peers that *are* exclusive will get
special treatment.  Prior to this change it looks like priority peers
were silently ignored when exclusive peers were provided.
Add missing pragma
Add missing pragma
Add missing pragma
Improved (fixed?) serialization for vec<uint32_t>
Comment unused functions in cryptonote_core