This recommended update for the Softwarestack fixes the following issues:

- zypper:
+ man: add section about GPG checks
+ repos/services: Show GPG Check status
+ Handle pkgGpgCheck callback (fate#314603)
+ download: fix wrong total (=0) counter in download message
+ download: actually abort on user request.
+ Clarify comment in zypper.conf (bnc#820693)
+ Fix format of sizes in output (bnc#897301)
+ Adapt enterprise product detection (bnc#933277)
+ removerepo: Warn user that deleting a service repo is a volatile change (bnc#929990)
+ Clarify 'zypper lp --date' description (bnc#929593)
+ Don't use color in XML mode.
+ fix table sort (bnc#832519)
+ only use ANSI codes on terminals (bnc#925678)
+ Fix prompt returning undefined default value after wrong input (bnc#925696)
+ man: fix typo (bnc#923800)
+ suppress MediaChangeReport while testing multiple baseurls (bnc#899510)
+ allow repo:package to reinstall from a different repo (bnc#725867)
+ fix wrong description of --force-resolution defaults
+ Updated translations

- libzypp:
+ zypp.conf: Add config values for gpgcheck, repo_gpgcheck and pkg_gpgcheck. The default behavior 'gpgcheck=On' will automatically turn on the gpg signature check for packages downloaded from repository with unsigned metadata. If the repo metadata are signed, a faster comparison via checksums is done. By explicitly setting repo_gpgcheck or pkg_gpgcheck you can enforce the signature check of repository metadata or downloaded packages to be always performed. Those defaults can be overwritten per repository. (FATE#314603)
+ Downloader: Accept unsigned repository if pkgGpgCheck is ON.
+ Fix SSL client certificate authentication via URL option ssl_clientcert/ssl_clientkey (bnc#932393)
+ FindFileConflicts: avoid nested exception on user abort (bnc#931601)
+ Fix repo alias containing ']' not handled correctly (bnc#929528)
+ Fix SEGV when dumping rpm header with epoch (bnc#929483)
+ POODLE: libzypp should only talk TLS (bnc#903405)
+ Suppress MediaChangeReport while testing multiple baseurls (bnc#899510)

- libsolv:
+ add forgotten sha-512 support to data_skip
+ speed up whatprovides lookup with a new helper array
+ fix dup with allowuninstall
+ improve alreadyinstalled handling of supplements
+ you really want to use rbconfig there