* #61: Preserve support for Python 2.6+.
  * Added `__future__` imports.
  * Fixed a few Python 2 issues.
* Changed absolute imports in package `cutplace` (`from cutplace import ...`) to relative ones (`from . import ...`). The imports in package `tests` remain unchanged because they actually are in a different package.
Merge branch 'master' of https://github.com/roskakori/cutplace