Single-user mode

 - Moves files to right place
 - Updates plgenerator signature
 - Updates API to last changes
Merge branch 'groupSuggestion' of https://github.com/lca4/unison-recsys into groupSuggestion
Merge branch 'groupSuggestion' of https://github.com/lca4/unison-recsys into groupSuggestion
Removed the parsing of uid and oldcid from URL. Removed the associated method : removeUserFromCluster.