remote master-key variable: it's configured on the master and propagated to the slave through /var/alternc now

add the concept of slaves in alternc core. slaves now have an alternc account that gets created by the alternc-slave package that the master can use to restart apache and bind on the fly

this aims to resolve a lot of mail problems we are having on our deployment at Koumbit

this makes sure that apache is properly restarted after install and factors code out of the two postinst files

Closes: #1017

starting this release, only named.conf.options will be replaced (as we
need to modify the options {} block and can't just add another one). We
still install a named.conf, a fresh version from Lenny this time, so
that we get a clean start.

Also get rid of the bind_internal parameter that is not really used or
recommended, as it allows for authoritative nameservers to also serve
recursive queries (which is bad practice).

See: #1025
Closes: #1104

postfix

also split the config prompts between slave and non-slave package

See: #1029

revert back to r2306: stay with only two packages for now, which should unbreak the main alternc package

note that we discarded some suggestions options:

F_LOG: replaced with syslog
DAEMON: will be considered for inclusion later
VERBOSE/DEBUG: available through command line flags

TYPE_NAME_BACKUP and ALLOW_OVERWRITE_BACKUP are being renamed to
SQLBACKUP_TYPE and SQLBACKUP_OVERWRITE. this is to be more consistent
with the global configurations

See: #1081

See: #318.

As of now, the MySQL configuration used everywhere by AlternC is not
stored in the main configuration file (/etc/alternc/local.sh) but in a
MySQL configuration file in /etc/alternc/my.cnf, which enables us to
call mysql without exposing the password on the commandline.

The changes here are quite invasive but will allow us to factor out
the MySQL configuration better. See #364.

This includes a partial rewrite of the mysql.sh logic, which is now ran
from the postinst script (and not alternc.install) which will allow us
to actually change the MySQL root user properly. See #601.

This commit was tested like this:

 * clean install on etch (working)
 * upgrade from a clean 0.9.7 (working)

add missing configuration that wasn't ran properly when installing, since initrep.sh was removed from the installation at some point. remove initrep.sh altogether since it's not required anymore. Closes: #1109.

version (2.9), config.inc.php gets called multiple times, which ends up
not including our config in later includes

Closes: #1052

fix the real problem: add postfix to the sasl group in postinst, so that we don't need postfix in pre-depends