kes Make arguments to get_scratch_volume() in same order as other

kes  Make arguments to get_scratch_volume() in same order as other
     such calls.
kes  Rework the prune_volumes() subroutine so that after purging and
     no volume found in desired pool, it will check for a scratch
     volume. This prevents recycling the whole scratch pool.
kes  Add code to status storage to print boffset_t (largefile support).

git-svn-id: https://bacula.svn.sourceforge.net/svnroot/bacula/trunk@5144 91ce42f0-d328-0410-95d8-f526ca767f89