#10 subsubmodel in submodels not displayed correctly

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Problem: if a submodel has a subsubmodel, then its image as a callout may not include the subsubmodel.
Reason: when the submodel is rendered, the renderer does not know about the subsubmodel since its
temporary file has not been written to the disk yet.

Solution: when a submodel is complete, write the corresponding temporary file to the disk right away.

File bug4.mpd is an example showing the bug
File bug4_patch.txt is a patch correcting the bug

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example showing the bug

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patch