Add a parameter to IARC algorithm

[depryf]

The current logic of that algorithm is meant to identifier (and filter out) the duplicates.

And so when two tumors are duplicate, it flags the first one as primary and the second one as duplicate.

This behavior doesn't work well for reviewing the duplicates, which involves reviewing the pairs of duplicates.

I would like to add a new "review" mode to the algorithm; in that mode, the the first element of the pair will be set to 2=primary-but-has-a-dup".

This won't become the default behavior and so this shouldn't affect anything.

[depryf]

Done, this will be available in version 4.10