[petsc-dev] patch for subcomm

[Stefano Zampini]

It  seems to me that the current code for PetscSubcommSetTypeGeneral
assumes that all colors will be provided within a range
[0,max_color_value_provided].
The current patch (which simply zeroes the subsizes array) extend the code
when there are holes in the colors' set.

-- 
Stefano
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