Broken link to "whatsnew_04_3.php" (regarding UseDirectionCosines) in `ElastixBase`

[N-Dekker]

ElastixBase::BeforeAllTransformixBase() produces a warning at https://github.com/SuperElastix/elastix/blob/b782a2c668dda95efdb29fb9a8db23eff3b2575a/Core/Kernel/elxElastixBase.cxx#L362-L364 saying:

"WARNING: From elastix 4.3 it is highly recommended to add the UseDirectionCosines option to your parameter file! See http://elastix.dev/whatsnew_04_3.php for more information.

However, whatsnew_04_3.php is not there, on elastix.dev. And it looks like it wasn't even there on elastix.lumc.nl It can still be found at the archived elastix.isi.uu.nl website, at https://web.archive.org/web/20180403070016/http://elastix.isi.uu.nl/whatsnew_04_3.php saying:

---

In previous versions of elastix, the image orientation (direction cosines) of images were ignored. In this version, they are correctly handled. For backward compatibility reasons, by default elastix still ignores the image orientation, but it is highly recommended to include the following line in your parameter file:

(UseDirectionCosines "true") 

In a future version of elastix we will change the default to true.