displayer doesn't want a fctx but a ctx. It failed with -Tdefault template.
Traceback (most recent call last):
...
File "mercurial/templatekw.py", line 212, in showbookmarks
bookmarks = args['ctx'].bookmarks()
AttributeError: 'filectx' object has no attribute 'bookmarks'
Many tests didn't change back from subdirectories at the end of the tests ...
and they don't have to. The missing 'cd ..' could always be added when another
test case is added to the test file.
This change do that tests (99.5%) consistently end up in $TESTDIR where they
started, thus making it simpler to extend them or move them around.
