Cleanup RELS-INT without white screening due to fix in https://github.com/Islandora/islandora/commit/4040b5997d8044faac8accfeb2f07ed309cfa087.
Merge pull request #80 from jordandukart/7.x-ISLANDORA-948

Cleanup RELS-INT without white screening due to fix in https://github.co...
Implement new hooks for optional statements.
Fix "inheritXacmlFrom" handling.
Somewhat better reporting.
Merge pull request #82 from adam-vessey/7.x-ISLANDORA-943

all works correctly on my local i7latest
Use URI constants.
Merge pull request #81 from adam-vessey/7.x-ISLANDORA-945

Implement new hooks for optional statements.