Reinstate changes lost due to automatic merging

The automatic merging code used `--strategy=ours`, which turned out to
be incorrect; instead we wanted `--strategy=recursive
--strategy-option=ours`. This small difference results in merging
throwing away _all_ EE changes in favour of CE changes, instead of only
doing this for conflicts.

This commit ensures that EE has all the appropriate changes. The diff
was generated by cherry picking all merge commits made since two days
ago, picking them with `--strategy=recursive --strategy-option=ours`.