* Introduced bee-factories, so we can have multiple instances of one kind of bee.
* Moved descriptors into factories.
* Adapt Descriptors and Chains to API changes.
* Define bees and chains in config file from now on. This breaks existing configs. Sorry.
* Created bee factories for our existing bees.
* Adapt existing bees to new API.
* Fixed existing config files to match new config-file format.
* Added an example config using two instances of an ircbee.