DS-1928 use the oai-identifier schema in <description>
DS-1947: Remove reference to missing file

The missing file, seems to be an Institution specific file. 

The missing file in question m-tweaks.js
[DS-2035] fixes: dim crosswalk is missing values for metadatafields with more than one value for the same language
Merge pull request #552 from antoine-atmire/DS-2035

[DS-2035] fixes: dim crosswalk is missing values for metadatafields with...
Merge pull request #507 from misilot/patch-4

DS-1947: Remove reference to missing file
Merge pull request #493 from helix84/DS-1928-OAI-identify

DS-1928 use the oai-identifier schema in <description>