ui.py: normalize settings every time the configuration changes
Previously, we would normalize settings (e.g. turn relative paths into
absolute ones) only after reading a config file.
Now "--config paths.foo=bar" will use the cwd to make "bar" an absolute
path.
adding dir/bar
adding foo
dir/bar
foo
adding dir/bar_2
adding foo_2
dir/bar_2
foo_2
adding a
adding c
adding b
adding d
removing a
removing c
recording removal of a as rename to b (100% similar)