add required headers for smtpd.h and remove unnecessary ones in other files.

ok jung@

replaces calls to err(3)/errx(3) with fatal()/fatalx() from log.c
for code that runs in the daemon.

ok florian@ millert@

the tree_* and dict_* api's in smtpd can be used standalone, do not have
them depend on smtpd.h, it makes it hard to reuse them elsewhere

ok eric@

use <limits.h> comprehensively. For now try to push <> includes to
each .c file, and out of the .h files. To avoid overinclude.
ok gilles, in principle. If this has been done right, -portable shou

use <limits.h> comprehensively. For now try to push <> includes to
each .c file, and out of the .h files. To avoid overinclude.
ok gilles, in principle. If this has been done right, -portable should
become easier to maintain.

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change dict_poproot() prototype: do not take key placeholder parameter as
it can't work that way.

allocate key storage dynamically instead of using a fixed size buffer

sync with OpenSMTPD 5.3.2

ok gilles@

Sync with our smtpd repo:

* first bricks of ldap and sqlite support (not finished but both working)
* new table API to replace map API, all lookups are done through tables
* improved handling of tem

Sync with our smtpd repo:

* first bricks of ldap and sqlite support (not finished but both working)
* new table API to replace map API, all lookups are done through tables
* improved handling of temporary errors throughout the daemon
* improved scheduler and mta logic: connection reuse, optimizes batches
* improved queue: more tolerant to admin errors, new layout, less disk-IO
* improved memory usage under high load
* SSL certs/keys isolated to lookup process to avoid facing network
* VIRTUAL support improved, fully virtual setups possible now
* runtime tracing of processes through smtpctl trace
* ssl_privsep.c sync-ed with relayd
* ssl.c no longer contains smtpd specific interfaces
* smtpd-specific ssl bits moved to ssl_smtpd.c
* update mail address in copyright

FLUSH YOUR QUEUE. FLUSH YOUR QUEUE. FLUSH YOUR QUEUE. FLUSH YOUR QUEUE.

smtpd.conf(5) simplified, it will require adaptations

ok eric@

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