Fix format warnings on 64bit machines
Delete all socket files on servald start

If serval does not close properly, socket files are kept in
/data/data/org.servalproject/var/serval-node. Therefore, we need to clean up
when servald starts.
overlay_mdp_bind and overlay_mdp_getmyaddr should be visible in MDP API
Make overlay_mdp_client_socket_path local

Unlink mdp sockets by asking the OS what the bound name was.
Log warning if meshms ply failed to open
Store journal appends to sql blobs in one burst
Fix bug in handling errno from lseek()
Fail writing content if it has already been closed
Don't clean the database for every command line operation by default
Use buffered reading for meshms ply records
Don't update the database author if we already know it
More consistent use of sleep_ms
Always store payloads with a temporary id
Merge remote branch 'origin/development' into meshextender
begin adding tx throttling for packet radios to avoid near constant
corruption of packets due to lack of flow control.