add python-lxml for python-systemd

(cherry picked from commit 17a18eb2645e9c15a13fba82b0db591c148d4a4d)
attempt parallel build

(cherry picked from commit 95a6ae15fdcda87e5cf47a0d96ce9a09b75fdb65)
Install busctl and translations

(cherry picked from commit 3853bf74f3102905b6587755781d1a42ea09f9da)
explicitly disable microhttpd

(cherry picked from commit 515ed789804047074e103d0cfb30d478bab5cbe0)
Install the new combined libsystemd0 library
Add new symbols file for libsystemd0.
Update symbols file for libgudev-1.0-0.
Remove pre-generated rules and unit files in debian/rules clean target.

These are generated with rootprefix=/usr and so has the wrong paths for Debian.
Add /run/shm -> /dev/shm symlink in debian/tmpfiles.d/debian.conf.
Update /run/initctl symlink target in debian/tmpfiles.d/debian.conf.

/dev/initctl is now a symlink to /run/systemd/initctl/fifo, so make /run/initct point directly to that.
Add support for rcS.d init scripts to the sysv-generator.
Do not order rcS.d services after local-fs.target if they do not explicitly depending on $local_fs.
Map init script dependencies on mountall, mountnfs and cryptdisks to the corresponding systemd targets
Prevent rcS.d services from depending on remote-fs.target or network-online.target.
Order rcS.d init scripts before basic.target instead of sysinit.target.
Add new systemd service users in systemd postinst.
Add missing system groups used in udev rules in udev postinst.
Add breaks on old syslog providers, they interact badly with the journal.
Add breaks on old resolvconf, it interacts badly with systemd-resolved.
Bump dependency on sysv-rc for updated update-rc.d.