[analyzer] Update Open Projects page with BitwiseConstraintManager.

Also, add the names of people most recently working on particular projects,
and remove "relate bugs and checkers" (thanks, Alex!).

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@205666 91177308-0d34-0410-b5e6-96231b3b80d8
[analyzer] Add an ErrnoChecker (PR18701) to the Potential Checkers list.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@205667 91177308-0d34-0410-b5e6-96231b3b80d8