properties geoLocation and radius and getter and setter added
tests for new properties geoLocation and radius added, stub tests completed
redundant and misplaced code from listAction and ajaxList action moved: all overwriteDemands are now handled in method overwriteDemandObject, filtering by (location and) radius is done in findDemanded method of AbstractDemandedRepository
radius search refactored: redundant and misplaced code from listAction and ajaxListAction moved to method overwriteDemandObject, method findByRadius moved to AbstractDemandedRepository, AbstractDemandObject extended by properties radius and geoLocation