def push(self, command, more):
        self.Refresh()
calls `git diff-tree` and returns tuples of the kind
dataset/ETHPy150Open xraypy/xraylarch/lib/wxlib/larchfilling.py/FillingText.push--crossover with--dataset/ETHPy150Open hvr/trac-git-plugin/tracext/git/PyGIT.py/Storage.diff_tree