Questions about code reviews and static analysis tools for TU Delft research

Hi everyone,

I'm doing research on code reviews and static analysis tools at the SERG group 
(http://swerl.tudelft.nl/bin/view/Main/WebHome) of the Delft University of Technology. Currently, 
we want to give an overview of the usage of code review and static analysis tools in open source 
projects. Therefore, I would be very happy to know a little bit more about how code reviews are 
used in LibreOffice and if (and maybe how) static analysis tools are used. I have a couple of 
questions for anyone willing to answer:

1. Do all developers (contributors and core developers) have to submit a code review for every 
change? I’m asking because many projects only review changes made by contributors.

2. Which code review tools are used?

3. Are static analyzers used? If they are used:
  a. Is passing the checks of the static analyzers necessary for a change to be accepted?
  b. Which static analyzers are used?

Thanks,

Radjino