Changeset 414 in orxonox.OLD

srrd: SR::Service

moved $self→{state_error_message} and $self→{state_error_timestamp}
to SR::Service & SR::Core::State. Note it's state_* and not status_*!

i also extended functions to:

answer_failing(<recall>, <error message, will get auto timestamped>)
answer_failed(<recall>, <error message, will get auto timestamped>)

one only has to call answer_failing() or answer_failed() to set the
state error message.

there are access methods:

state_error_message()
state_error_timestamp()

and a clear method:

state_clear_error()