Force tasksel/desktop to gnome in g-i-i_d_jessie_gnome job.
chroot-run.sh minimal should bootstrap a minbase

This should further reduce the incurred io load.
chroot-install: clean downloaded packages

Downloaded packages can consume rather large amounts of space (more than
2GB in some cases). By removing them early, we may be able to avoid
writing them to a physical disk reducing the load imposed by the test.
The major use case is running chroot-installations on tmpfs.
rebootstrap: remove unsupported architectures ia64 and s390
limit lintian job runs to 6h
limit other lintian jobs to 6h as well
Merge branch 'gg0/gnomedesktop'

Currently g-i-installation_debian_jessie_gnome actually installs xfce as
can be seen for example in one of the screenshots of
https://jenkins.debian.net/job/g-i-installation_debian_jessie_gnome/65/.
Thanks to Gabriele Giacone for the report and solution.
d-i logparse rules: ignore warnings as requested by KiBi in <20140916211708.GW2754@mraw.org>
use cgit anonscm-links on alioth instead of gitweb.
g-i: schedule debian-edu wheezy-test installation less often (only once a month now)
fix typo
g-i edu: add new test, 'Debian Edu (jessie) main-server', and run this and the jessie Edu standalone test, daily for the next weeks
g-i: only workaround #757818 on squeeze+wheezy, which are affected by the bug. this speeds up jessie tests.
start with sid-reproducible jobs. totally WIP atm
fixup reproducible jobs
2nd attempt at building reproducible packages
reproducible jobs: make basic job working
reproducible: more progress
reproducible: explicitly create dedicated base.tgz for pbuilder
reproducible: finally working version. now fails due to a (known) problem in reproducible build toolchain. added TODO for jenkins jobs. added new job to test all core packages (one day)