[maven-release-plugin] prepare release bUnwarpJ_-2.6.13

Make release 2.6.12:

Major changes:
* Fix bug reported by @mariokreutzfeldt (issue #5).

[maven-release-plugin] prepare release bUnwarpJ_-2.6.11

Make release 2.6.10.

Major changes:
* Fix bug when scaling some images with odd dimensions.

Bump to next release cycle.

Make release 2.6.8.

Major changes:
* Fix bug when macro-recording opposite elastic transformation comparison.

Make release 2.6.7.

Major changes:
* Make I/O commands macro-recordable.

[maven-release-plugin] copy for tag bUnwarpJ_-2.6.6

Make release 2.6.5.

Major changes:
* Fix bug when registering non-square images using subsampling.

Make release 2.6.4.

Major changes:
* Bug fix: look for landmarks file from macro call.