Basic WalkSAT version.
Variables are chosen among candidates in only ONE top level assertion.
Flip rate increased by roughly 10%-300% compared to GSAT.
Restarts after 100 plateaus.
Fps slightly decreased due to restarts. 

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