Implemented a JavaHandler for Accessor, getAllParent
Merge branch 'tp-2.4.0-sparql' into tp-2.4.0-new-features
Make the belongsToAdmin method recursive instead of using the (looping)
GremlinGroovy annotaton to fetch all parents.

The GremlinGroovy method is (as of frames 2.3.x) apparently quite slow,
so avoiding invokations is useful.
Convert frames to use JavaHandler instead of GremlinGroovy. A few other small tweaks.
Remove construction of graph with GremlinGroovy module, now not needed.

Also improve the performance of belongsToAdmin function, and put the
isAdmin function on the frame (rather than doing it in the AclManager.)
Whoops, added bug into belongsToAdmin. Such a simple function can
apparently make me quite stupid.

Conflicts:
	ehri-frames/src/main/java/eu/ehri/project/acl/AclManager.java
Add a test that would've caught the last buggy commit.