fix #1895 : update Quark by git pull
and git checkout master
#1954
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Even though it was doing git pull, it would not have repositioned to the tip if you had for any reason checked out a different tip (detached HEAD). This has to assume that master is the only branch where the latest update can be found.
If somebody needs to specify a different branch then they need to do release with tags and check it out by tag.