Add test for rule 2-13-5 to wishlist.
Add tests for rule 3-1-1.
Move test for rule 3-1-1 as there is no checker for this rule ATM.
Fix typo.
Always report the real (spelling) location.
Fix check for whether doxygen documentation is being built.
Allow all checkers to access the compiler instance.
Simplify code for picking up the names of registered checker.
Improve tests for rule 2-13-4, expose bug.
Fix checker for rule 2-13-4.