v7.0-beta.50

* Add /api/refData/v1/lookup REST endpoint for doing ref data lookups.

* Issue **#1755** : Stepping now runs in a separate thread to prevent interruption of DW threads when trying to terminate stepping early.

* Issue **#1798** : Fixed REST serialisation issue that was preventing stepping XPath filters from being passed to the server.

* Issue **#1666** : Stepping now loads element documents that use name patterns.

* Issue **#1666** : Parsers now support name patterns for loading config documents.

* Issue **#1835** : Fix error when viewing data as lowly user.

* Issue **#1836** : Fix Forbidden error when importing data.

* Issue **#1809** : Fix handling of import with no permissions except Import Configuration.

* Issue **#1657** : Remove INTERNAL_PROCESSING_USER from Users list in App Permissions screen.

* Issue **#1782** : Fix handling of empty NOT/AND/OR in stats queries and immprove the error handling for the remote data sources.

* Issue **#1781** : Fix SQL stats handling of NOT() with more than one term in the NOT.

* Issue **#1830** : Change quick filters on Annotations screen to use fuzzy filtering consistent with the rest of stroom. Disable the comment quick filter drop down if there are no standard comments configured. Remove the qualified fields from the quick filter tooltips.

* Issue **#1829** : Fix Annotations screen recording change history when clicking an empty title/subject.

* Issue **#1737** : Fix quick filter in users/groups popup.

* Issue **#1832** : Fix inability to add users/groups in the Document Permissions screen.