applying changes on the default branches

[c.]

Hi all,

There some changes I have been postponing for a long time since the 3.8 release 
was "imminent".

In particular I'd like to apply Kai's changesets implementing incomplete 
factorizations, which I held back 
as I didn't want to add the new dependency on ITSOL just yet.

Would it be OK if I start working on merging in those changesets on the default 
branch now that is it separate 
from the stable branch?

c.