inheritance tree.

Set the daemon name to be 'aggregatord' in the call to the constructor of
castor::service::BaseDaemon.

Added a started daemon log message.

Removed database service initialisation code, as aggregatord will not connect
to a database.

Protected the code against castor::server::BaseServer::dlfInit() throwing an
exception.

tape aggregator daemon.

Implementing correct usage of exceptions. This means that the serrno is correctly set in the C interface now. The correct way to display an error message now is thus to first use sstrerror and then use getErrorMessage for a complement of information