Cache the data of the type checker.
Each time a type is computed, the data is saved in a cache 
in case of a new build the cache for the building resource is
reinitialized. Performance are now acceptable for type management
some improvements 
add elements in UI to create new instance and change the name of the
view
prepare code for attributes traceability
traceability modified when configuration is selected
fix bug with default configuration retrieving
Fix NPE
Merge branch 'master' of https://github.com/aradouan/ReqCycle