new command "automate ancestors". Basically a copy and
paste from automate descendents with a query/replace
descendent->ancestor. Also adapted the documentation. autotest
coming up shortly...
Add new test for "automate ancestors". Still *failin* as
it a) outputs an empty newline if no ancestor exists and b) it does
not seem to output all ancestors if multiple revids are supplied as
input. This is so wierd as it is a literal copy'n paste f
fix typo in automate.cc. Add sanity checks to prevent passing NULL
revision_ids around (some _were_ passed around. Apparently the
underlying get_revision_parents doesn't make sure we don't get NULL
ids (need to check further).
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