targets/*: Blacklist selected releases/distros.

We use exit status 99 to indicate that a given combination is
unsupported (so we can detect it in tests).
targets/lxde: Do not install network-manager

Affects mainly Debian wheezy/jessie: When the chroot is terminated,
network-manager is killed, which brings down the wifi connection.

Does not hurt to specify it on non-Debian.
chromium: Debian has no chromium package for ARM. Sorry.

Also fix Debian package name (chromium-browser is an alias
on wheezy only).
test/39-alltargets: Test if all targets can at least be installed.

*common is blacklisted, as well as a few other lucky few.
targets/kali: Mark relevant targets as unsupported (same as wheezy).
Fix after review.
test/alltargets: Move from 39 to x0, so we run it on demand only.
Merge branch 'alltargets' into croagh_arch
arch/unity: Blacklisted by other test already.