Bring CHANGELOG up to date
Upgrade columnize
Remove dead code
Minor style change

Just to fit my personal coding style.
Actually return fullpath

In that case, the leading backslash was not being returned.
Much nicer way of asserting backtraces
This test in different from the standard test case

So it doesn't need to inherit from it.
Fix param name
Remove unncessary check
Qualify method call
Better save tests
Don't use inheritance where not needed
Debug each test in a different file

This is to ensure more isolation in preparation for threading support.
Don't really know whether it's necessary but it might help to prevent
surprises.
Minor refactoring in tests