AutoRotation BugFixes

[m-2k]

1. using old-style next_id(atom(),integer()) for tables and non-atom for
   custom counters
2. fix count/1, all/0, index/3 and dump/0 funs with rotation logic
3. extend dump fun:
   • use dump() for detail listening
   • use dump(short) for summary
   • use dump(table) or dump(TableList) for custom view

91> kvs:dump(short).
                NAME                     STORAGE TYPE    MEMORY (MB)   ELEMENTS

        subscription                    [disc_copies]           0.00          0
              config                    [disc_copies]           0.01          1
                 log                    [disc_copies]           0.00          0
           operation                    [disc_copies]           0.00          0
              id_seq                    [disc_copies]           0.06        505
               entry                    [disc_copies]           0.00          0
             comment                    [disc_copies]           0.00          0
                feed                    [disc_copies]           0.02        132
               party                    [disc_copies]           0.01         10
               board                    [disc_copies]           0.02         59
                post   [disc_copies,disc_only_copies]       18745.80    9976442
          attachment                    [disc_copies]           0.23        402

Snapshot taken: {{2016,8,29},{15,37,52}}
ok