tune some scheduling settings for pejacevic
p-s: always pass --arch <arch> to piuparts

Signed-off-by: Andreas Beckmann <anbe@debian.org>
Remove need for chdir() before loading packagesdb.

... in piuparts-report and detect_well_known_errors.

Establish the full path to the directory as 'prefix'.
The calc_rrdep_counts() call is hiding the potential need for the
directory to be correct in other places. Removing the rrdep calc
would otherwise cause a crash.

Signed-off-by: Andreas Beckmann <anbe@debian.org>
changelog, TODO, and whitespace cleanup

Signed-off-by: Andreas Beckmann <anbe@debian.org>