This was a vestige from when we used to need the unittest2 library for pre-2.7
compatibility. Now that we require Python 2.7, we aren't using that library
and this indirection wasn't doing any good.
This reverts commit 9c41c39913.
That commit used byte strings for the `if __name__ == '__main__'` pattern,
which was necessary when we were doing unicode_literals. But it is wrong on
Python 3, and now that we're liberated from unicode_literals, we need to go
back to native strings for this comparison.
Include import of __future__ features division, absolute_imports and
print_function everywhere. Don't add unicode_literals yet for it is
harder to convert.
Goal is smoothing the transition to python 3.
Fix for the `ImportAdded` plugin crashing during in-place imports (#1107).
Add support for the new link imports introduced in Beets 1.3.9.
Note that link-imports that preserve file modification times will follow
the links and preserve the mtimes on the link targets. The mtimes on the
links aren't modified.
The tests verifies that the `importadded` plugin updates added dates and
mtimes when importing:
* an album
* an album with file mtime preservation on
* singletons
* singletons with file mtime preservation on
It also verifies the the plugin doesn't update added dates when
re-importing:
* an album
* singletons
