- I found out that we finally have problems with the (somewhat recursive)

    call to logerror() that many of the modules do. I have not tried it,
    but I think things will become wild when we compile without pthread
    support. Threading prevents full recursion, so we have not seen any bad
    effects so far. However, the problems that I experienced in ommysl
    (that caused me to re-structure startWorker()) are actually rooted in
    this issue. I first thought to fix it via a module interace, but I now
    came to the conclusion that it is not more effort and much cleaner to
    do an internal error buffering class. This is implemented in
    errbuf.c/h.
- I just noticed that this is not actually an error buf, but the core of an
    input module for all internal messages. As such, I implement it now as
    iminternal.c/h. Of course, there is no input module interface yet
    designed, but that doesn't matter. Worst-case, I need to re-write the
    im, best case I can use the im (at least partly) to define the
    interface.
- added a few functions to the linkedlist class
- error messages during startup are now buffered - so we do no longer need
    to think about how emergency logging might work. Actually, these are
    logged to whatever is instatiated in the log file. This enhances the
    chance that we will be able to drop the error message somewhere it is
    seen.

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