In the old code, we would do this during interpretation.  But we need
to move that to the compilation to make this work properly without
full recalculation during ods import.

For 4.0, we'll just add calls to insertRefCells in ScCompiler.  On
master we should remove these calls from the old places to avoid
duplicate calls.  Duplicate calls for the same external file ID - cell
address pair will not hurt; it just adds more overhead.

Change-Id: I25cf2e08195da17c6c8f7d19c74d744df6e1638e