Support a finer grained initial conversion commit.

As some sources were imported gradually in different commits,
it's neater to squash those commits together, even if this
means doing it out of order.

This causes less file churn overall and prevents the whole
delete and readd problem (breaking git blame and friends).

Sadly due to the use of binary data in the svn commits
which 'patch' cannot apply, we have to use svn merging
to ensure things are done properly. This means creating
a dummy svn repo and synthesising commits before exporting
it to form the initial squashed commit.

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