merging / integrating a subrepo into its parent

[Benoit Fouletier]

I have the following structure:
* main
  * sub

sub is currently stored in a subrepo: now I would like to have it as a
regular subfolder of main, with its history stored in main.

I know I could use hg pull --force to add it as a parallel branch, then
merge the heads, and the end result would look like this:
    o-main1-main2-main2------------------o
                                        /
                        o-sub1-sub2-sub3

... but it feels like a shame to lose the main <-> sub relationship tracked
by .hgsubstate, so basically I would like to rewrite it to:
    o-main1-sub1-main2-sub2-main2-sub3-o
--> is there a way to achieve that? perhaps using hg convert?

I am fine with rewriting history, changing hashes and recloning everything.
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