next patch

Tomorrow, I'm gonna commit the following, after triple-checking everything, write documentation
and changelog:

- mysql configuration -> odded patch and something more
- uniformization in at2 and emi2 logs: every debug/info/etc line says EMI2[%s]: or AT2[%s]: 
at2 remains with device name, emi2 uses the smsc-id or if undefined, our-host:our-port->host:port
(or shorter string combinations if our-host or our-port is undefined)
- emi2 our-host configuration
- emi2 alt-host or/and alt-port -> if host connection fails, kannel try to connect to alt-host:alt-port
(or combinations of host:alt-port or alt-host:port if one is undefined)
- %u with udh value in sendsms-service 
- fix to latest patch
- I've added a header "Server: kannel-VERSION" to http