scripts/pre_remove_exceptions: a bit cleaner cleanup
custom-scripts: work around issues in gnome, kde, mate, sucrose & razorqt desktops which install systemd-sysv which is not straight forward to remove again
custom-scripts: also work around issues (see previous commit) in packages for the xfce4 desktop as well as more gnome and mate packages
custom-scripts: only workaround systemd-sysv removal issues on sid, jessie + experimental
instances/piuparts.conf.pejacevic: Results from debsums on wheezy2jessie and wheezy2bpo2jessie are not being ignored anymore as #744398 has been fixed thanks to Axel Beckert.
custom-scripts: fix bashism
piuparts.py: fix typos in comment
custom-scripts: also work around systemd-sysv removal issues for more kde packages and ltsp-server-standalone
piuparts-report.py: De-indent global summary func

Remove four spaces of indent from the body of
generate_global_summary().
piuparts-report.py: Refactor global summary

Factor out the section sorting logic to from generate_global_summary()
to another function, sections_by_precedence().
Remove oldstable and older from p.d.o summary

There is a desire in the DDPO integration to add value to the Piuparts
column by showing more detail in the failures, and to winnow out chaff
in the reporting.

The details on how to do this are not fully developed. In the
meantime, as a first, interim, step, configure p.d.o to remove summary
reporting for section tests involving oldstable and older.
Remove stable dist results from p.d.o summary

Select this commit for further de-chaffing of the JSON summary.

Remaining sections are currently:

experimental
jessie
sid
sid2experimental
sid-nodoc
testing2sid
piuparts-report.py: Restore counts.txt to web

Commit 70fe80693 moved the counts.txt file, which drives the section test
result chart, from the web section directory to the master section directory,
making it no longer visible from a web view. This change restores a copy of
the counts.txt file to its original location, in the web section directory.
piuparts-report.py: Link to counts.txt

Below the chart on each section page.