Migration to Lucene 4.9.0. Indexing, faceting and searching are working. Errors on CaseInsensitiveFieldComparatorSource.
Fix sort accross multiple languages.
Fix test failing due to change on indexing any field. This should not happen as the scale denominator 50000 should be part of the suggestion in the test. This need more investigation to identify why this is not part of the index terms.
Merge remote-tracking branch 'origin/stable-develop' into improvements/update-to-lucene-4.9.0

Conflicts:
	core/src/main/java/org/fao/geonet/kernel/search/LuceneSearcher.java
Cleaning.
Cleaning.
Cleaning.
find UI - massive ownership update fix

The group service now returns <record> anchors instead of <groups>. This
is probably related to JPA migration.
Merge pull request #606 from fxprunayre/improvements/update-to-lucene-4.9.0

Update to lucene 4.9.0
Delete metadata / Add a parameter to not create backup file. This will allow to avoid failure if 2 records with same UUID are inserted using CSW #609
CSW / GetCapabilities does not report correct URL in multinode mode #610.
Activate scrollspy only if is enabled.
Editor performance improvements.

Create a new scope for the editor form and destroy it when form is reloaded.
Remove form elements to avoid larged detached DOM trees in Chrome.
Field directive : remove events on directive DOM elements added in the link function.
Editor / Add configuration to insert text element in the form #611.
Ignore rebel.xml files.
Editor / Associated resource panel / Fail to add link to service metadata record #613
Merge pull request #607 from pmauduit/find-ui-massive-ownership-fix

find UI - massive ownership update fix
Restore md.group.update security mapping dropped in e3bd5f958a4c17707a909bc932e4ad8b0a2c32b6.
ISO19139 / Index standard name.
Exclude fields from language detection.