Issue77 Add evaluation contexts, to be passed into the evaluators by the search methods

src/search/open_lists/open_list_buckets.h

 #ifndef OPEN_LISTS_OPEN_LIST_BUCKETS_H
 #define OPEN_LISTS_OPEN_LIST_BUCKETS_H
 
 #include "open_list.h"
 #include "../scalar_evaluator.h"
 
 #include <deque>
 #include <utility>
 #include <vector>
 
 class Options;
 
 template<class Entry>
 class BucketOpenList : public OpenList<Entry> {
     typedef std::deque<Entry> Bucket;
     std::vector<Bucket> buckets;
     mutable int lowest_bucket;
     int size;
 
     ScalarEvaluator *evaluator;
     int last_evaluated_value;
     bool last_preferred;
     bool dead_end;
     bool dead_end_reliable;
 protected:
     ScalarEvaluator *get_evaluator() {return evaluator; }
+    void evaluate(int g, bool preferred);
+    bool is_last_evaluated_dead_end() const;
 
 public:
     BucketOpenList(const Options &opts);
     ~BucketOpenList();
 
     int insert(const Entry &entry);
     Entry remove_min(std::vector<int> *key = 0);
     bool empty() const;
     void clear();
 
-    void evaluate(int g, bool preferred);
-    bool is_dead_end() const;
     bool dead_end_is_reliable() const;
     void get_involved_heuristics(std::set<Heuristic *> &hset);
 
     static OpenList<Entry> *_parse(OptionParser &parser);
 };
 
 #include "open_list_buckets.cc"
 
 // HACK! Need a better strategy of dealing with templates, also in the Makefile.
 
 #endif