Static checker updates.
- Skip checking of _rootcint.cxx files.
- Replace the hardcoded list of directory names for code that is to be considered thread-safe with a configuration parameter.
- For warnings about calling non-const methods via a pointer member from a const method, realize that unique_ptr::get() also returns the pointer. Treat it like operator->. Also fix an issue with suppressing this warning for unique_ptr.
- Don't warn about overriding the non-const execute() method of Algorithm with a non-thread-safe method.
- Fix warning suppression for ctor calls.
- Remove references to ATLAS_CTORDOR_NOT_THREAD_SAFE workaround.
- Warn about writing via a pointer member in a const member function.
The last of these generates some new warnings. I've fixed all that i've seen, but it's possible that there may be others.