Various changes that simplify running cppcheck, comparing results
from the previous execution.
- Create a summary of the log that groups errors by type,
useful since some kinds of warnings tend to lead to errors in the
code more than others.
- Keep a copy of the previous runs logs - useful for comparisons.
- Log the output in the order of the files selected to check.
- Fix non thread-safe output sometimes mixing warnings from different
processes.
f6605523e8