two chroot related fixes

- Pass SCR root path to stdio agents [bnc#879365](https://bugzilla.novell.com/show_bug.cgi?id=879365).
- If aborting on a SCRAgent::targetPath assertion, log it [bnc#891053](https://bugzilla.novell.com/show_bug.cgi?id=891053)

Potential clutter of multiple editor configs is a valid concern.
I also considered to put it to my $HOME configuration, but that does not fit well: this config describes the indentation style used *in this repository*. It does belong there. Except we would like to have one solution that works for all editors. We only need the vi users to start using Emacs ;-) See also http://lists.opensuse.org/yast-devel/2013-10/msg00005.html