simpler abstract repository layer
towards state-based repositories
repositories delegate to state-based ones
refined package structure for repositories
state-based repositories have a dedicated interface
simpler design for memory-based repository
more simplifications in memory-based repositories
multi queries return iterables
Merge branch 'state-based-repos'

Conflicts:
	cotrix/cotrix-web-importwizard/src/main/java/org/cotrix/web/importwizard/server/climport/Importer.java
	cotrix/cotrix-web-importwizard/src/main/java/org/cotrix/web/importwizard/server/climport/ImporterFactory.java