Work on radius geo filter
Implements #477
Conflicts:
	src/main/java/com/jaeksoft/searchlib/cache/FilterCache.java
	src/main/java/com/jaeksoft/searchlib/filter/AuthFilter.java
	src/main/java/com/jaeksoft/searchlib/filter/FilterAbstract.java
	src/main/java/com/jaeksoft/searchlib/filter/GeoFilter.java
	src/main/java/com/jaeksoft/searchlib/filter/QueryFilter.java
	src/main/java/com/jaeksoft/searchlib/filter/RelativeDateFilter.java
	src/main/java/com/jaeksoft/searchlib/filter/TermFilter.java
	src/main/java/com/jaeksoft/searchlib/index/DocSetHitCacheKey.java
	src/main/java/com/jaeksoft/searchlib/index/IndexSingle.java
Update dependencies
Update ZK library
Fix error message when trying to query the radius and filling in a
distance.
Merge pull request #480 from emmanuel-keller/master

Bug and improvement