randomize counter part of uid's generated with generate_uid()
fixed
add a stub for table(5)
Merge branch 'master' of ssh.poolp.org:/git/opensmtpd
remove blank line
start documenting table.5
document userinfo tables.
fix formatting while there.
document addrname table
wrong format
finish table.5
install table.5
fix ninflight counting
plug memleak
make sure that all members are correctly initialized
fix prototype
empty line
The notion of mta batch in the scheduler has no use anymore.
Simplify the code.
fix scheduler wrt suspended envelopes:

- removing a suspended envelope removes it right away.
- suspending a inflight envelope marks it as suspendend on return
- scheduling a suspended envelope schedules it immediatly, but keeps
  it suspended (no automatic scheduling).
When an inflight envelope is removed, mark it as such and schedule it
for removal on update.
remember the current holdq for an envelope.