system-info: fetch vcs settings from vcsserver. Fixes #4276 - redone the system info page. Errors/Warnings now show next to the data, and also show up in API call. - implemented fetching of git/hg/svn version from running vcsserver - implemented fetching of vcsserver version from itself - added more warnings/errors detection on RAM/Inodes etc - few cleanups

http: better reporting of msgpack unpack errors.

Added request header downgrade for COPY command to work on https setup. Fixes #4307

subrepo: Handle subrepo merge errors.

subrepo: Add exception for subrepo merge errors.

subrepo: Add merge failure reason code ad message for subrepo merge conflicts.

subrepo: show subrepo as dir path.

libraries: bumped ipython to 5.10, bumped ipdb to 0.10.1

templates: fixed missing suffixes for checkboxes in vcs settings

meta-tags: fixes #4305, metatags are not taken into account when truncating output. - also makes the personal repo groups show special tag disregarding if metatags are on or off - truncate via CSS instead of hardcoded 60 chars