Store the grammars and config file used nearby the test results. Remove valueless RQG logs.

1. A bughunt.pl run stores it's results in <storage_prefix>/<runid>.
    The testing grammar (-> grammar), the object creation
    grammar (-> gendata) and any config file (-> config) must be also
    stored (as sql.yy, data.zz, run.cfg) within this directory.
    sql.yy and data.zz must be used as parameters when calling runall.pl.
    Hereby we can avoid a lot complications which arise if the original
    files get accidently modified or removed (bzr pull , edit the grammars)
    during the bughunt run or between bughunt run and analysis of it's results.
     - The delay between bughunt run and analysis could be some
        minutes till days.
     - The analysis might cause that additional RQG runs with the old
       grammars have to be performed.
2. RQG logs with a status code = 0 should be automatically deleted.
    Their value - we can reveal that we had somewhere in history a run
    with certain settings and status code = 0 - is extreme low.
    But such logs could waste a lot space in filesystems.
    IMHO a bughunt where we search for any status code including 0 but
    some specific pattern within the log is very unlikely.