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news for release 936 since 935
------------------------------
* simple minimal unsatisfiable core (MUS) extractor 'picomus'
(example for using 'picosat_mus_assumptions' and 'picosat_coreclause')
* added 'picosat_mus_assumptions'
* added 'picosat_{set_}propagations'
* new 'int' return value for 'picosat_enable_trace_generation' to
check for trace code being compiled
news for release 935 since 926
------------------------------
* added 'picosat_failed_assumptions' (plural)
* new '-A <failedlits>' command line option
* fixed failed assumption issues
* added 'picosat_remove_learned'
* added 'picosat_reset_{phases,scores}'
* added 'picosat_set_less_important_lit'
* added 'picosat_res'
news for release 926 since 846
------------------------------
* random initial phase (API of 'picosat_set_default_phase' changed)
* fixed accumulative failed assumption (multiple times)
* fixed missing original clause in core generation with assumptions
* fixed debugging code for memory allocation
* shared library in addition to static library
* removed potential UNKNOWN result without decision limit
* added picosat_set_more_important_lit
* added picosat_coreclause
* propagation of binary clauses until completion
* fixed API usage 'assume;sat;sat'
* literals move to front (LMTF) during traversal of visited clauses
* switched from inner/outer to Luby style restart scheduling
* less agressive reduce schedule
* replaced watched literals with head and tail pointers
* add 'picosat_failed_assumption', which allows to avoid tracing and core
generation, if one is only interested in assumptions in the core
* fixed a BUG in the generic iterator code of clauses
(should rarely happen unless you use a very sophisticated malloc lib)
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 assignment)
- 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
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