Basic WalkSAT version.
Variables are chosen among candidates in only ONE top level assertion.
Chooses a random top level assertion instead of using a BFS approach (_BFS_ == 0).
No restarts.

#define _CNF_ 0
#define _BFS_ 0
#define _FOCUS_ 1
#define _RESTARTS_ 0
#define _TIMELIMIT_ 300
#define _SCORE_AND_AVG_ 0
#define _SCORE_OR_MUL_ 0

BUGGY VERSION! Uses wrong value for modulo operation in assertion selection.