news for release 846 since 632
------------------------------

* cleaned up assumption handling (actually removed buggy optimization)

* incremental core generation 

* experimental 'all different constraint' handling as in our FMCAD'08 paper

* new API calls: 

  - picosat_add_ado_lit       (add all different object literal)
  - picosat_deref_top_level   (deref top level assighment)
  - picosat_changed           (check whether extension was possible)
  - picosat_measure_all_calls (per default do not measure adding time)
  - picosat_set_prefix        (set prefix for messages)

* 64 bit port (and compilation options)

* optional NVSIDS visualization code

* resource controlled failed literal implementation

* disconnect long clauses satisfied at lower decision level

* controlling restarts
